Kleem Organics Vitamin C

Kleem Organics Vitamin C

Product Name:Kleem Organics Vitamin C Serum

Overall Rating:

Serum Type:Anti-aging

Size: 1 fl oz

Price: $69.99

Cost Per Ounce: $69.99

Where to Buy:Click Here

# of Ingredients: 17

Notable Ingredients:Vitamin C, Hyaluronic Acid, Witch Hazel, Organic Jojoba Oil, Rose Ether, Organic Aloe Vera, Horsetail, Dandelion, and Geranium Plant Extract

Overall Opinion:

I honestly can't get over how much I like Kleem Organics Vitamin C Serum.  From the first time I used it, I could tell that I was going to enjoy using this face serum.  It is easy to apply, feels extremely comfortable on your skin, and smells absolutely delicious.

Other than the ease and enjoyment of using the actual face serum, it completely delivers on the anti-aging claims it makes on the packaging. From decreasing fine lines and wrinkles and minimizing the appearance of dark sun spots, to increasing hydration and leaving my skin with a vibrant glow, there is a lot to love about this serum.

Unfortunately, if you're looking for a face serum to decrease your pores, Kleem Organics Vitamin C Serum fails to deliver those results, but if you're in the market for almost any other anti-aging benefits, this serum is one to consider (even if it has a higher price tag)!

Detailed Opinion:

Texture/Feel

Kleem Organics Vitamin C Serum has a texture very similar to your average face serum.  It has more of a gel-like consistency, and left a very moisturizing, and soft, feeling behind on my face and neck after I applied it.

The feel of this face serum is genuinely one of the most comfortable face serums I've ever applied and worn, and didn't feel like I had anything on my skin once it had absorbed.

Application

The application of Kleem Organics Vitamin C Serum is extremely easy. I love that it has the pump packaging, and you only need about half a pump worth to cover your face and neck.  A little goes a long way so definitely push the pump slowly so you don't get too much product out.

To use this serum, simply cleanse your face, and if you use a toner like me, apply that beforehand, as well.  Once the toner has dried, apply the serum to both your face and neck.  Once that's absorbed, follow with your moisturizer and any other face products you use.

Use this serum both morning and night! Bonus—you can easily wear this under your makeup without getting oily, which is great for anyone with oily or combination skin!

Drying Time

Kleem Organics Vitamin C Serum absorbs super quickly, which I love!  After applying the serum to my face and neck, it took about 20 seconds for it to be fully absorbed.

Smell

I absolutely LOVE the smell of Kleem Organics Vitamin C Serum.  This is exactly the type of smell I expect from a Vitamin C serum.  It has a sweet, citrus smell, and made me feel like I was in a high-end spa.

The smell isn't overpowering, but it doesn't dissipate once it absorbs into your skin.  I personally loved that aspect about it, but someone who is sensitive to smells may not like that about this serum.

Immediate Results

As I do with every new face serum I try, I used Kleem Organics Vitamin C Serum at night first.  My first thought was how much I loved the experience of actually using the serum.

When I woke up the next morning, I could tell I was going to like this serum. I had such a refreshed, vibrant appearance to my skin when I woke up.  The glow was no joke, and my skin felt so supple!  I was honestly amazed at how quickly I saw these results and how beautiful my skin looked after sleeping all night.

Long Term Results

I can't get over how amazing the results I achieved with Kleem Organics Vitamin C Serum are.  This is truly an anti-aging serum that delivers on its claims.

I saw a major difference in my sun and age spots, and in my fine lines and wrinkles, too! I also experienced insane hydration and plumpness to my skin, as well as the most vibrant glow.  I may not be that old, but this serum gave me more of a youthful look than most other serum I have ever tried, specifically when it came to the overall firmness of my skin.

This serum really does rewind the clock on your face, in many different aspects.  The only claim it made that I don't think it delivered on was minimizing my pores.  I personally struggle with large pores in my T-zone, and I just didn't see any change there.

Price/Value

This product is SO worth the money!  And when I was gathering the facts for this review, they had Kleem Organics Vitamin C Serum on sale, too, so it was less than $35.

While this may be on the higher end of the price scale for face serums, the results this serum delivers, and how incredible the actual act of using it is, made it so easy and enjoyable to incorporate into my skincare routine.  And it actually delivers on its anti-aging claims, which is the most important part.

I'd be willing to spend even more than $70 on this serum, so I can say without a doubt that it's absolutely worth the money you pay for it.

Guarantee

Kleem Organics offers a 100% money-back guarantee on all of their products.

Where To Buy

To purchase Kleem Organics Vitamin C Serum, click here.

Kleem Organics Vitamin C Serum: Summary

Factor	Kleem Organics Vitamin C Serum
Overall Rating
Texture/Feel	Average face serum consistency; doesn't leave behind any residue—extremely moisturizing and soft feeling on skin once absorbed
Application	Apply half a pump worth of product to clean, dry skin. Once the product has absorbed, apply moisturizer and other products on top. Use twice daily.
Drying Time	20 seconds
Smell	Sweet, citrus smell; not overpowering but does not go away once absorbed
Immediate Results	Brighter complexion; vibrant, refreshed look on my face
Long Term Results	Decrease in wrinkles and age spots, increase in glow, hydration, and overall skin firmness.  Doesn't decrease size of pores as advertised
Ingredients	Vitamin C, Hyaluronic Acid, Witch Hazel, Organic Jojoba Oil, Rose Ether, Horsetail, Dandelion, and Geranium Plant Extract, Organic Aloe Vera
Price	$69.99
Guarantee	100% money-back guarantee
Where To Buy	Click Here

Kleem Organics Vitamin C Serum Review

Kleem Organics Vitamin C

Source: https://www.faceserum.com/kleem-organics-vitamin-c-serum-review/

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Is It Safe To Take Vitamin C Supplements

Is It Safe To Take Vitamin C Supplements

A Guide to Vitamin C Serums

leonori/Shutterstock

For 70 years Vitamin C has been one of the biggest weapons in the skin care industry. It's used to make cleansers, moisturizers, lotions, masks, and serums. So what is this powerful vitamin? How can it benefit you? Why should you use serums that contain Vitamin C? We're here to answer all of those burning questions in this complete guide and reveal the many benefits Vitamin C serums offer for your skin.

What Are Vitamin C Serums?

There are many variations of Vitamin C, but the most popular is ascorbic acid, a common ingredient in skincare products. However, all the variations of Vitamin C have anti-inflammatory benefits.

Vitamin C Serums are products that contain a high level of Vitamin C. They're used to treat wrinkles, sagging skin, lighten dark or red spots, prevent breakouts and even your skin tone. Basically, they battle all of those annoying skin issues. There are loads of products out there that claim they'll save your skin, but some can cause damage. Vitamin C is one of the most revered ingredients and conclusive research has shown how effective it can be.

How Are Vitamin C Serums Made?

Well so far we've talked about how incredible Vitamin C is and it sounds like a dream come true doesn't it? It's not all good. In fact, the mighty vitamin is unstable when it's exposed to air and light. Other ingredients need to be used to stabilize it and allow it to deliver amazing results. The serums are combined with ferulic acid and Vitamin E. According to researchers the perfect mixture is 15% Vitamin C with 1% Vitamin E and 0.5% ferulic acid. This makes Vitamin C perform to the best of its abilities, without damaging your skin.

What Does Vitamin C Serum Do for Your Face?

Boosts Collagen Production: Collagen keeps your skin firm and prevents sagging. Environmental factors such as lifestyle choices and pollution can increase the elasticity of your skin, so it's important you try to increase your collagen production.

Hydrates Your Skin: Dry skin is a common issue, but Vitamin C can help to give your skin that much-needed moisture boost. Remember, it doesn't work immediately so you need to keep applying the serum to see results.

Brightens Your Complexion: Dark spots on your skin are caused by the overproduction of melanin. Vitamin C decreases the production and lightens the dark spots to even out your complexion.

Reduces Redness and Inflammation: Conditions such as Rosacea leave many people searching for a magic cure. Vitamin C helps facial redness and inflammation by reducing the appearance of broken capillaries.

Why Should You Be Using Vitamin C Serum?

Don't think Vitamin C serums are just beneficial for your face. They can also shield you from sun damage and reduce stretch marks.

Saves You From The Sun: Prolonged exposure to UV rays can cause long-term damage to your skin. Luckily, Vitamin C is a powerful antioxidant that reduces red sports and prevents sunburn from spreading.

Fades Acne Scars: Acne plagues most of us at some point and we look forward to being free. Most of us get stuck with some scars but Vitamin C helps to fade scars and even out any discoloration.

Reduces Stretch Marks: Yes, Vitamin C serum can even help prevent those unsightly stretch marks by tightening your skin.

Are you ready to change your skin? Add a Vitamin C serum to your beauty regimen and enjoy a glowing complexion.

Is It Safe To Take Vitamin C Supplements

Source: https://www.bloglines.com/article/a-guide-to-vitamin-c-serums?utm_content=params%3Ao%3D740010%26ad%3DdirN%26qo%3DserpIndex

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How Many Grams Of Vitamin C In A Grapefruit

How Many Grams Of Vitamin C In A Grapefruit

1. Home
2. References

Grapefruit: Health Benefits & Nutrition Facts

Half a grapefruit provides more than half of the recommended daily amount of vitamin C. (Image credit: Andreygorlov | Dreamstime)

Grapefruit is a popular citrus fruit that is a terrific source of vitamins, fiber and other nutrients. Grapefruit is known for its antioxidant- and immunity-boosting capabilities as well as its digestive and cholesterol-lowering benefits.

Grapefruit provides vitamins A and C, folate (B9), fiber, choline, limonins and lycopene, according to Alissa Rumsey, a New York City-based registered dietitian, certified strength and conditioning specialist and spokesperson for the Academy of Nutrition and Dietetics.

"Grapefruit has been hailed as a popular diet food for many years because it is widely believed to boost weight loss," said Rumsey. "While a grapefruit diet is far too extreme, the fruit can be added to one's diet for a healthy weight loss plan."

Grapefruit gets its name from the way it grows. Grapefruits grow on tree branches in grape-like clusters, according to the Library of Congress.

Puzzling history

Grapefruit is an accidental hybrid between the orange and the pomelo, but no one is sure when it was first grown. It was first documented in 1750 by a Welshman in Barbados who described it as a "forbidden fruit," according to the Purdue University horticulture department. Until the 19th century, it was also called the shaddock, named after a sea captain who is said to have brought the seeds of a pomelo to Jamaica. It has also been called paradise fruit. It was given the scientific name, Citrus paradisi, but in the 1940s when research confirmed that it was hybrid, the name was changed to Citrus x paradisi — the x indicates that it is a hybrid.

Grapefruit grows in warm climates; Florida and southern areas of China are the world's top producers. There are several varieties of grapefruit, including white, ruby red and pink, which have varying levels of sourness and sweetness. "Try topping it with savory seasonings, like cilantro or chili powder, to offset the tangy flavor," Rumsey suggested. She noted that grapefruits go well with seafood dishes, too.

Here are the nutrition facts for grapefruit, according to the U.S. Food and Drug Administration, which regulates food labeling through the National Labeling and Education Act:

Nutrition Facts Grapefruit, raw red or pink Serving size: 1/2 fruit (3-3/4" dia)(123 g) Calories 52   Calories from Fat 1 *Percent Daily Values (%DV) are based on a 2,000 calorie diet.	Amt per Serving	%DV*		Amt per Serving	%DV*
Total Fat 0g	0%		Total Carbohydrate 13g	4%
Cholesterol 0mg	0%		Dietary Fiber 2g	8%
Sodium 0mg	0%		Sugars 8g
Protein 1g
Vitamin A	28%		Calcium	3%
Vitamin C	64%		Iron	1%

Health benefits

Immunity

According to the George Mateljan Foundation's World's Healthiest Foods website, half a medium-size grapefruit provides 59 percent of your daily vitamin C needs.

"Vitamin C is plays a role in immunity and helps neutralize free radicals in our body," said Rumsey. According to the Linus Pauling Institute at Oregon State University, vitamin C stimulates the production of white blood cells and may protect the integrity of immune cells. Vitamin C helps also protect leukocytes, which produces antiviral substances.

Heart health

Vitamin C is linked to a reduced risk of cardiovascular disease, said Rumsey. A 2015 study published in The American Journal of Clinical Nutrition looked at more than 100,000 people and found that those who ate the most fruits and vegetables had a 15 percent lower risk of developing heart disease. Those with the highest vitamin C levels in their plasma had even more reduced rates of heart disease.

Kidney stones

According to University of Wisconsin Health, citric acid, which is found in grapefruit, may deter stone formation and also break up small stones that are forming. The more citric acid in your urine, the more protected you may be from forming new kidney stones. A study published in theBritish Journal of Nutrition found that women who drank one-half to one liter of grapefruit, orange or apple juice each day saw their urinary pH value and citric acid excretion increase, which significantly lowered their risk of forming kidney stones.

Cancer

According to Rumsey, vitamin C and beta-carotene may lead to a reduced risk of esophageal cancer. A study published in the Journal of Chemotherapy found that vitamin C supplementation exerted a chemotherapy-like effect on esophageal cancer cells. The researchers suggested that vitamin C might improve the efficacy of chemotherapy.

According to the Physician's Committee for Responsible Medicine, red and pink grapefruit is one of the best sources for lycopene after tomatoes."Lycopene has been linked to a decreased risk of prostate cancer," said Rumsey. A large-scale study of nearly 50,000 men published in the Journal of the National Cancer Institute found an inverse relationship between lycopene (in this study, the lycopene was from tomatoes) and prostate cancer risk. Men with the highest levels of lycopene were 21 percent less likely to develop prostate cancer than those with the lowest lycopene levels.

The lycopene in grapefruits may also contribute to reducing risk of stomach cancer, according to a review in the Journal of Cancer Prevention. Researchers looked primarily at participants who smoked, suffered from chronic inflammation or had elevated levels of stomach bacteriaHelicobacter pylori, though they noted that poor diet and family history could also be risk factors lessened by lycopene.

Animal studies have suggested that grapefruit may have a reduction effect on colon cancer cells. A study published in the journal Carcinogensis found that grapefruit increased the death of cancer cells in rats whose colons had been injected with carcinogens.

"There are numerous studies being conducted to understand the role folate plays in cancer reduction," Rumsey said. A 2007 article in the American Journal of Clinical Nutrition noted that folate's possible cancer-reducing properties are likely linked to its role in the production of substances that silence cancer DNA.

Limonins have also been linked to a decrease in cancer risk, said Rumsey. A 2012 article in the Journal of Nurtigenetics and Nutrigenomics looked at limonins in breast cancer cells and found that they could be a helpful aid to chemotherapy.

Pregnancy health

"Folate is essential for pregnant women in order to prevent neural tube defects," said Rumsey. While folate is present in prenatal vitamins, consuming it through whole foods is an excellent way to make sure the body absorbs it.

Antioxidants

An article in the Journal of Agricultural and Food Chemistry evaluated the phenolic compounds in 13 fruit juices. Grapefruit juice ranked among the best juices. Phenolic compounds act as antioxidants, which are molecules that safely interact with free radicals to stop the condition of oxidative stress, according to an article in Pharmacognosy Review. Free radicals cause cell damage and disruption that can contribute to diseases. Vitamin C is also a potent antioxidant.

Hydration

"Grapefruit is 91 percent water, so can help with hydration," said Rumsey.

Digestion

The fiber and water in grapefruit can aid digestion and help relieve or prevent constipation, according to the Mayo Clinic.

Weight loss

"Grapefruit is naturally high in fiber, which contributes to feelings of satiation which can prevent overeating," said Rumsey. "Fiber also helps stabilize blood sugar levels, preventing spikes that contribute to hunger."

A study published in the Journal of Medicinal Food looked at 91 obese patients who took either grapefruit capsules, grapefruit juice, half of a fresh grapefruit or placebo capsules. All grapefruit-taking patients lost more weight than the placebo group, with those eating fresh grapefruit losing the most and those drinking grapefruit juice losing nearly as much. The grapefruit groups also saw improved insulin resistance and metabolic syndrome.

Cholesterol

"Grapefruit contains pectin, a fiber that is can reduce LDL cholesterol levels and decrease triglycerides," said Rumsey. A study published in the Journal of Agricultural and Food Chemistry looked at 57 hyperlipidemic patients after coronary bypass surgery and found that supplementing their diets with either white or red grapefruit every day for 30 days lowered LDL cholesterol levels. Eating red grapefruit lowered LDL cholesterol levels more, and also lowered triglycerides.

Skin, hair and wound healing

According to a study published in the British Journal of Community Nursing, vitamin C is essential throughout the wound-healing process, largely because it contributes toward collagen synthesis and development. Collagen is also essential for healthy skin and hair. Furthermore, vitamin A is known to promote healthy tissue growth, including in skin, and the high water content in cantaloupes helps keep skin moisturized and supple.

Eyesight

Vitamin A, of which grapefruit is a good source, is essential for good vision. Through a complicated process in the eye, vitamin A (also called retinol) triggers an electrical signal in the optic nerve, causing the perception of colors and vision in dim light, according to the Linus Pauling Institute at Oregon State University. Vitamin A (acquired through phytonutrient beta-carotene, also found in grapefruit) is associated with a reduced risk of macular degeneration.

Risks of eating grapefruit

Some drugs become more potent when combined with grapefruit juice. These drugs include the immunosuppressent cyclosporine (Restasis, Neoral, Sandimmune), calcium-channel blockers (Norvasc, Cardizem, Procardia and others), the antihistamine terfenadine (Seldane), the antiviral agent saquinavir (Invirase) and the hormone estradiol, according to World's Healthiest Foods.

People taking statins may want to avoid grapefruit. Grapefruit causes a higher amount of statins to enter the circulatory system than would normally. This causes a build up of statins that can be dangerous and lead to a rare, serious disease called rhabdomyolysis.

Individuals taking pharmaceutical drugs, particularly statins, should consult a doctor before eating grapefruit.

Additional resources

• FDA: Grapefruit Juice and Medicine May Not Mix
• World's Healthiest Foods: Grapefruit
• Library of Congress: How Did the Grapefruit Get Its Name?

How Many Grams Of Vitamin C In A Grapefruit

Source: https://www.livescience.com/54746-grapefruit-nutrition.html

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Goldfish Vitamin C Enriched Flakes

Goldfish Vitamin C Enriched Flakes

Researchers in the United Kingdom say a study on eyesight shows diet and environmental factors are more important than genetics in lowering risk of cataracts.

Eating an apple a day may keep the doctor away, but eating oranges might do the same for cataracts.

In a study published today in the journal Ophthalmology, researchers in the United Kingdom said a higher dietary intake of vitamin C might significantly reduce the risk of developing cataracts.

The study, led by scientists at King's College London, is the first to conclude that dietary and environmental factors play a larger role than genetics in the development of cataracts.

"The findings of this study could have significant impact, particularly for the aging population globally by suggesting that simple dietary changes such as increased intake of fruits and vegetables as part of a healthier diet could help protect them from cataracts," Dr. Chris Hammond, professor of ophthalmology at King's College, consultant eye surgeon and lead author of the study, said in a statement.

Read More: What Is a Cataract? »

The researchers estimated genetic factors account for 35 percent of the difference in cataract progression. Environment and lifestyle account for 65 percent.

To study the impact diet has on cataracts, the researchers tracked the progression of the eye condition in 324 pairs of female twins from the United Kingdom.

The scientists examined digital images of the women's eye lenses when they were about 60 years old. They then studied the same type of images 10 years later.

They kept track of the women's intake of vitamins A, B, C, D, and E. They also tracked their intake of copper, manganese, and zinc using a food questionnaire.

The researchers said the women who ingested more vitamin C initially had a 20 percent reduced risk of developing cataracts. After 10 years, that risk had decreased by 33 percent.

The researchers noted that there was little risk reduction in the women who took vitamin supplements. Instead the preventative effects appeared to be obtained only by eating foods rich in vitamin C.

Dr. Ravi D. Goel, an ophthalmologist from New Jersey who is also a clinical instructor at Wills Eye Hospital in Pennsylvania, said the study provides helpful information for patients and doctors.

"These are novel findings for patients going forward," Goel, a spokesperson for the American Academy of Ophthalmology, told Healthline. "This is a helpful tool for patient education."

Read More: Americans Spend Billions on Vitamins and Supplements That Don't Work »

Cataracts occur when the lens of the eye becomes cloudy due to oxidation over a long period of time.

The researchers said the fluids that bathe the eye are rich in vitamin C, which helps stop the lens from oxidizing.

The dietary intake of vitamin C helps prevent cataracts by increasing the amount of this vitamin in the eye fluid.

The researchers added that smoking and diabetes also are risk factors for certain kinds of cataracts, so a balanced diet and healthy lifestyle are important.

"Healthy diets are always an advantage for patients," added Goel.

Goel also said vitamin C has already been shown to help slow the progression of age-related macular degeneration.

This latest information on cataracts adds to vitamin C's attributes. "It helps overall eye health," he said.

The researchers did note that their observational study has its limitations as it only involved women who were aged 60 years and older.

However, the researchers believe the information could also be relevant for male patients.

Cataracts are the leading cause of blindness in the world, affecting about 20 million people, according to statistics from the World Health Organization (WHO). Cataracts also affect 24 million Americans over the age of 40.

The condition can cause blurry vision, glare, poor night vision, and sensitivity to light.

Initially, better lighting and glasses may help ease some of the symptoms, but as cataracts progress surgery is sometimes needed.

Read More: Diabetes and Blurry Vision: What You Need to Know »

Goldfish Vitamin C Enriched Flakes

Source: https://www.healthline.com/health-news/vitamin-c-may-reduce-risk-of-cataracts

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Excessive Intake Of Vitamin C

Excessive Intake Of Vitamin C

Vitamin C toxicity is very rare. Some people take high doses of vitamin C because it is an antioxidant.

Vitamin C (ascorbic acid) is essential for the formation, growth, and repair of bone, skin, and connective tissue (which binds other tissues and organs together and includes tendons, ligaments, and blood vessels). It is also essential for the normal function of blood vessels. Vitamin C helps maintain healthy teeth and gums. It helps the body absorb iron, which is needed to make red blood cells. Vitamin C also helps burns and wounds heal. Good sources of vitamin C include citrus fruits, tomatoes, potatoes, broccoli, strawberries, and sweet peppers. (See also Overview of Vitamins Overview of Vitamins Vitamins are a vital part of a healthy diet. The recommended dietary allowance (RDA)—the amount most healthy people need each day to remain healthy—has been determined for most vitamins. A safe... read more .)

Like vitamin E, vitamin C is an antioxidant: It protects cells against damage by free radicals, which are by-products of normal cell activity and which participate in chemical reactions within cells. Some of these reactions can cause damage over a person's lifetime.

Some people take high doses of vitamin C because it is an antioxidant, which protects cells against damage by free radicals. Free radicals are thought to contribute to many disorders, such as atherosclerosis, cancer, lung disorders, the common cold, and memory loss. However, whether taking high doses of vitamin C protects against or has any beneficial effect on these disorders is unclear; most studies have shown no benefit. Evidence of a protective effect against cataracts is strongest.

High doses (up to the safe upper limit—2,000 milligrams a day) of vitamin C are usually not toxic to healthy adults. Occasionally, higher doses cause nausea or diarrhea and interfere with the balance of antioxidant activity in the body.

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Excessive Intake Of Vitamin C

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Dose Journaliã¨Re Vitamine C

Dose Journaliã¨Re Vitamine C

Is a glass of OJ or vitamin C tablets your go-to when the sniffles come? Loading up on this vitamin was a practice spurred by Linus Pauling in the 1970s, a double Nobel laureate and self-proclaimed champion of vitamin C who promoted daily megadoses (the amount in 12 to 24 oranges) as a way to prevent colds and some chronic diseases.

Vitamin C, or ascorbic acid, is a water-soluble vitamin. This means that it dissolves in water and is delivered to the body's tissues but is not well stored, so it must be taken daily through food or supplements. Even before its discovery in 1932, nutrition experts recognized that something in citrus fruits could prevent scurvy, a disease that killed as many as two million sailors between 1500 and 1800. [1]

Vitamin C plays a role in controlling infections and healing wounds, and is a powerful antioxidant that can neutralize harmful free radicals. It is needed to make collagen, a fibrous protein in connective tissue that is weaved throughout various systems in the body: nervous, immune, bone, cartilage, blood, and others. The vitamin helps make several hormones and chemical messengers used in the brain and nerves. [2]

While megadosing on this vitamin is not uncommon, how much is an optimum amount needed to keep you healthy, and could taking too much be counterproductive?

Recommended Amounts

• RDA: The Recommended Dietary Allowance for adults 19 years and older is 90 mg daily for men and 75 mg for women. For pregnancy and lactation, the amount increases to 85 mg and 120 mg daily, respectively. Smoking can deplete vitamin C levels in the body, so an additional 35 mg beyond the RDA is suggested for smokers.
• UL: The Tolerable Upper Intake Level is the maximum daily intake unlikely to cause harmful effects on health. The UL for vitamin C is 2000 mg daily; taking beyond this amount may promote gastrointestinal distress and diarrhea. Only in specific scenarios, such as under medical supervision or in controlled clinical trials, amounts higher than the UL are sometimes used. [2]

Vitamin C absorption and megadosing

The intestines have a limited ability to absorb vitamin C. Studies have shown that absorption of vitamin C decreases to less than 50% when taking amounts greater than 1000 mg. In generally healthy adults, megadoses of vitamin C are not toxic because once the body's tissues become saturated with vitamin C, absorption decreases and any excess amount will be excreted in urine. However, adverse effects are possible with intakes greater than 3000 mg daily, including reports of diarrhea, increased formation of kidney stones in those with existing kidney disease or history of stones, increased levels of uric acid (a risk factor for gout), and increased iron absorption and overload in individuals with hemochromatosis, a hereditary condition causing excessive iron in the blood. [2]

Absorption does not differ if obtaining the vitamin from food or supplements. Vitamin C is sometimes given as an injection into a vein (intravenous) so higher amounts can directly enter the bloodstream. This is usually only seen in medically monitored settings, such as to improve the quality of life in those with advanced stage cancers or in controlled clinical studies. Though clinical trials have not shown high-dose intravenous vitamin C to produce negative side effects, it should be administered only with close monitoring and avoided in those with kidney disease and hereditary conditions like hemochromatosis and glucose 6-phosphate dehydrogenase deficiency.

Vitamin C is involved with numerous metabolic reactions in the body, and obtaining the RDA or slightly higher may be protective against certain disease states. However, a health benefit of taking larger amounts has not been found in people who are generally healthy and well-nourished. Cell studies have shown that at very high concentrations, vitamin C can switch roles and act as a tissue-damaging pro-oxidant instead of an antioxidant. [2,3]Its effects in humans at very high doses well beyond the RDA are unclear, and can lead to increased risk of kidney stones and digestive upset.

Vitamin C and Health

There is interest in the antioxidant role of vitamin C, as research has found the vitamin to neutralize free radical molecules, which in excess can damage cells. Vitamin C is also involved in the body's immune system by stimulating the activity of white blood cells. Does this translate to protection from certain diseases?

Chronic diseases

Although some epidemiological studies that follow large groups of people over time have found a protective effect of higher intakes of vitamin C (from food or supplements) from cardiovascular disease and certain cancers, other studies have not. Randomized controlled trials have not found a benefit of vitamin C supplements on the prevalence of cardiovascular disease or cancer. The inconsistency of the data overall prevents the establishment of a specific vitamin C recommendation above the RDA for these conditions. [2]

Age-related vision diseases

Vitamin C has also been theorized to protect from eye diseases like cataracts and macular degeneration. Human studies using vitamin C supplements have not shown a consistent benefit, though there appears to be a strong association between a high daily intake of fruit and vegetables and decreased risk of cataracts. [4]

The common cold

Despite being a popular fix, vitamin C's cold-fighting potential hasn't panned out. Reviews of several studies show that megadoses (greater than 500 mg daily) of supplemental vitamin C have no significant effect on the common cold, but may provide a moderate benefit in decreasing the duration and severity of colds in some groups of people. [2] Small trials suggest that the amount of vitamin C in a typical multivitamin taken at the start of a cold might ease symptoms, but for the average person, there is no evidence that megadoses make a difference, or that they prevent colds. [5]

Food Sources

Fruits and vegetables are the best sources of this vitamin.

• Citrus (oranges, kiwi, lemon, grapefruit)
• Bell peppers
• Strawberries
• Tomatoes
• Cruciferous vegetables (broccoli, Brussels sprouts, cabbage, cauliflower)
• White potatoes

Signs of Deficiency

Vitamin C deficiency is rare in developed countries but may occur with a limited diet that provides less than 10 mg daily for one month or longer. In developed countries, situations at greatest risk for deficiency include eating a diet restricted in fruits and vegetables, smoking or long-term exposure to secondhand smoke, and drug and alcohol abuse. The following are the most common signs of a deficiency.

• Scurvy, the hallmark disease of severe vitamin C deficiency, displays symptoms resulting from loss of collagen that weakens connective tissues:
  • Skin spots caused by bleeding and bruising from broken blood vessels
  • Swelling or bleeding of gums, and eventual loss of teeth
  • Hair loss
  • Delayed healing of skin wounds
• Fatigue, malaise
• Iron-deficiency anemia due to decreased absorption of non-heme iron

Did You Know?

• Vitamin C improves the absorption of non-heme iron, the type of iron found in plant foods such as leafy greens. Drinking a small glass of 100% fruit juice or including a vitamin-C-rich food with meals can help boost iron absorption.
• Vitamin C can be destroyed by heat and light. High-heat cooking temperatures or prolonged cook times can break down the vitamin. Because it is water-soluble, the vitamin can also seep into cooking liquid and be lost if the liquids are not eaten. Quick heating methods or using as little water as possible when cooking, such as stir-frying or blanching, can preserve the vitamin. Foods at peak ripeness eaten raw contain the most vitamin C.

Related

Vitamins and Minerals
Common Questions About Fruits and Vegetables

References

1. Carpenter KJ. The history of scurvy and vitamin C. Cambridge: Cambridge University Press, 1986.
2. Institute of Medicine (US) Panel on Dietary Antioxidants and Related Compounds. Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington (DC): National Academies Press (US); 2000.
3. Poljšak B, Ionescu JG. Pro-oxidant vs. antioxidant effects of vitamin C. Handbook of Vitamin C Research: Daily Requirements, Dietary Sources and Adverse Effects (pp.153-183). January 2009. Nova Science Publishers, Inc.
4. Huang G, Wu L, Qiu L, Lai J, Huang Z, Liao L. Association between vegetables consumption and the risk of age-related cataract: a meta-analysis. Int J Clin Exp Med. 2015 Oct 15;8(10):18455-61.
5. Douglas RM, Hemila H, Chalker E, Treacy B. Vitamin C for preventing and treating the common cold. Cochrane Database Syst Rev. 2007:CD000980.

Updated March 2020

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Dose Journaliã¨Re Vitamine C

Source: https://www.hsph.harvard.edu/nutritionsource/vitamin-c/

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Does Guava Contain Vitamin C

Does Guava Contain Vitamin C

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Hepatitis is a condition that causes inflammation of your liver. Currently, there are an estimated 6 million people living with hepatitis in the United States, and more than 50,000 people are diagnosed with this disease every year. There are three primary types of hepatitis, and while their symptoms can be similar, they vary largely in the ways they're transmitted. Learning more about each type of hepatitis can help you better understand the condition as a whole.

Hepatitis A is the most easily transmitted of the three viruses. It affects approximately 2,500 people every year in the United States. It typically spreads through feces-contaminated food or water and is found in the feces of people who have the virus. Hepatitis A causes a short-term, acute sickness that most people heal from without treatment. However, it can cause serious illness in some people. This virus is more common in places with underdeveloped sanitation systems.

While doctors can't treat hepatitis A with medication, people who get this virus can manage its symptoms with fluids, rest and good nutrition. There's also a safe and effective vaccine available to protect you against hepatitis A.

What Is Hepatitis B?

Hepatitis B can occur both acutely (meaning it develops quickly and lasts a short time) and chronically (meaning it develops slowly over time and worsens over months or years). According to the Centers for Disease Control and Prevention, up to 2 million people in the United States are chronically affected with hepatitis B. Hepatitis B can be transmitted through sexual activity and exposure to infected blood. It can also be passed from a parent to their newborn child during birth.

Hepatitis B usually causes short-term discomfort that many people recover from completely after about four to eight weeks. However, it can turn into a chronic condition that lasts for years; this is more likely in older adults. Doctors can treat severe chronic hepatitis B with antiviral medications. However, in most cases, treatments focus on proper hydration and nutrition. There's a safe vaccine available to protect you against hepatitis B, too.

What Is Hepatitis C?

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Approximately 4 million people in the United States are affected with hepatitis C. This form of hepatitis causes a chronic illness in over 50% of people who get this type of the virus. It's the least transmissible of the three viruses and can spread through contact with infected blood.

Hepatitis C occurs more commonly in people who engage in intravenous drug use. If you received a blood transfusion before 1992, you should also get tested for hepatitis C if you haven't previously. Hepatitis C can spread through unprotected sexual intercourse, but this is a less common way to transmit it. While there's no vaccine for chronic hepatitis C, treatments that are available today offer a 95% cure rate.

Chronic hepatitis C can significantly affect how your liver works. It can cause cirrhosis, which means that your normal liver tissue is replaced with scar tissue. It can also cause liver cancer. However, there are medications that can help keep this disease in check. Making lifestyle changes, such as reducing or eliminating alcohol from your diet, can also decrease your chances of experiencing complications. In severe cases, hepatitis C may require a liver transplant.

The varying forms of viral hepatitis affect millions of people in the United States. Chronic hepatitis often has few symptoms in its early stages, so recognizing the associated dangers and getting tested if you've been exposed may save your life. Although there are five types of viral hepatitis, only A, B and C are the forms commonly found in the United States.

Resource Links:

"Hepatitis A, B, and C: Learn the Differences," Immunization Action Coalition

"What's the Difference Between Hepatitis A, B and C?," UNC Health Talk

"The ABCs of Hepatitis," Centers for Disease Control and Prevention

"What's the Difference: Hepatitis B vs Hepatitis C?," Hepatitis B Foundation

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Does Guava Contain Vitamin C

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