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How Many Grams Of Vitamin C Per Day

Dietary Reference Intakes For Vitamins E And C

Can I have too much Vitamin C? | Ask Gundry

The Food and Nutrition Board of the Institute of Medicine, a part of the US National Academies, has established a system of dietary reference intake values for the US population that, for the first time, provides advice on the safety of the nutrients. Safety is defined as presenting no unreasonable risk of illness or injury or a reasonable certainty of no harm, under labeled or ordinary conditions of use, as set forth in US laws and regulations for dietary supplements and food additives. The DRI system includes the estimated average requirement, the recommended dietary allowance , and the tolerable upper intake level . The RDA represents the recommended daily intake for meeting normal nutritional needs and preventing clinical deficiency. Compared with the previous RDA, the new recommendations for vitamin E have been increased by 50% for men and by almost 100% for women. Similarly, the new recommendations for vitamin C have been increased by 25% for women and by 50% for men. The DRI values include a UL, which is the maximum amount considered safe for healthy people when used daily for long periods. The RDA and UL values are based on exhaustive reviews of the scientific literature. RDA and UL values for vitamins E and C are shown in .

Can You Take Too Much Vitamin C

The tolerable upper intake for adults is 2 grams of Vitamin C consuming more than that can result in diarrhea and other unpleasant GI disturbances, says Greaves. She admits that severe side effects from too much ascorbic acid are very rare, but you may experience some discomfort if you take too much. Its pretty much impossible to have a vitamin C overdose, but lets not test that out.

The real problem with taking more vitamin C than you need is that it all goes to waste. Up to 100 mg a day of vitamin C will get almost completely absorbed, says Francesco-Maria Serino, MD, PhD. Above 100 mg a day and the fraction of vitamin C absorbed is progressively smaller. If you take more than 1 gram of vitamin C per day, less than 50% is actually absorbed and its eliminated by the kidneys.

That literally means that a 500 mg vitamin C supplement mostly gets peed down the drain.

What’s The Best Form Of Vitamin C To Take

Vitamin C supplements are available in many forms, the most common being ascorbic acid , followed by mineral ascorbates like sodium ascorbate, calcium ascorbate, potassium ascorbate, and magnesium ascorbate. And although less common, “you’ll also find unique vitamin C complexes with lipid or other bioactive components to elevate the absorption profile, as well as food-derived vitamin C sources in supplements ,” shares Ferira.

Depending on the dose, the bioavailability of vitamin C supplements can differ, which means some forms are able to enter your gut and circulation more easily, then get to work, traveling to cells around the body to scavenge free radicals *

“Free radicals can cause wear and tear to all parts of the body, including the brain and mind,” says dietitian Joanna Foley, R.D., CLT. But the right type of vitamin C can combat oxidative compounds head-on.*

While ascorbic acid and mineral ascorbates certainly have their merits and definite efficacy in lower doses , research shows that at more potent doses , a scientifically advanced vitamin C complex that includes lipid and citrus bioflavonoid componentsspecifically, a vitamin C compound called PureWay-Chas superior absorption and free-radical-scavenging abilities and can raise vitamin C blood levels and support anti-inflammatory actions more efficiently than other forms of vitamin C like ascorbic acid, calcium ascorbate, and calcium ascorbate-calcium threonate-dehydroascorbate .*

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What Do We Use Ourselves

We believe there is a reasonable burden of scientific evidence to suggest that on a short-term basis, taking large amounts of vitamin C might offer benefits which outweigh the potential risk of increased ROS generation.

Based on studies, that may range from 1,000 mg to 5,000 mg daily for a period of days or weeks. However its important to remember that using beyond the RDA has not been proven to offer any increased health benefit. It should not be used for the treatment of any disease. High amounts should be viewed as a dietary supplement only.

For long term usage, such as several consecutive months or 1+ years, taking too much vitamin C does not seem worth it when you weigh the risk for kidney stone formation and the still lingering unknown of how much excess ROS might be created from its Fenton reactions.

During pregnancy, to avoid any potential risk for vitamin C toxicity or adverse reactions, we would stay within the Tolerable Upper Intake Levels both on a short and long term basis. Thats 1,800 mg per day for women 14 to 18 years of age who are pregnant or breastfeeding and for ages 19+ thats 2,000 mg.

All of us at Superfoodly use numerous supplements but we do not take vitamin C capsules or tablets on a daily or even weekly basis. Rather, we rely on a plant-based whole food diet that is already a rich source, combined with an organic multivitamin that provides a more moderate among for long term usage 80 mg which equals 130% of daily value.

Vitamin C: The Evidence For Safety

How Much Vitamin C Per Day Is Healthy

The preponderance of scientific evidence, which has been thoroughly reviewed by several authors, shows consistently that vitamin C is safe at intakes of 2000 mg/d . Several hypothesized adverse effectsincluding the hypotheses of adverse effects of increased oxalate and kidney stone formation, increased uric acid concentrations, excess iron absorption, reduced vitamin B-12 concentrations, systemic conditioning , and prooxidant effectswere examined in detail and were found to have no substantive basis .

Although vitamin C supplementation may be less studied than vitamin E supplementation for the prevention for chronic disease, several clinical trials are relevant to its safety evaluation . For example, in the Roche European American Cataract Trial , the Age-Related Eye Disease Study , and the simvastatin-niacin study of Brown et al , patients who received the vitamin cocktails also ingested vitamin C at doses of 750, 500, and 1000 mg/d, respectively. A combination of 800 IU vitamin E/d and 1000 mg vitamin C/d has been reported to attenuate the beneficial effects of a combined simivastatin-niacin treatment when measured as angiographic endpoints, but it had no significant effects on the treatments clinical endpoints . The meaning of this observation with respect to the safety of vitamin E, vitamin C, or both in the presence or absence of simivastatin and niacin is not known.

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Vitamin C Dosage For Kids

The amount of vitamin C your child needs has been determined by the Food and Nutrition Board at the Institute of Medicine of the National Academies and is based on the recommended dietary allowance .

The vitamin C dosage for a child is based on age, not gender as in adults:

  • The daily requirement of vitamin C for infants 0 to 6 months: 40 milligrams
  • The daily requirement of vitamin C for infants 7 to 12 months: 50 milligrams
  • The daily requirement of vitamin C for kids 1 to 3 years: 15 milligrams
  • The daily requirement of vitamin C for kids 4 to 8 years: 25 milligrams
  • The daily requirement of vitamin C for kids 9 to 13 years: 45 milligrams


The daily requirement of vitamin C for infants is based on the mean intake of the vitamin in healthy breastfed babies.

Once the teenage years hit, your childs vitamin C needs differ based on gender. Teen girls need 65 milligrams a day, while teen boys need 75 milligrams a day. The recommendations are similar for adults, with men requiring 90 milligrams a day and women 75 milligrams.

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Whats The Best Way To Take Vitamin C

Both experts stress that the best way to take vitamin C is through food. Whole foods contain a vitamin and micronutrient complex which cannot be fully replicated in vitamin supplements, says Dr. Serino. Also, your body absorbs more of the vitamin through food than through a supplement.

In my experience, most people do not need to supplement with vitamin C since it is abundant in food, says Greaves. The best sources of vitamin C are foods like bell pepper, brussels sprouts, strawberries, and citrus fruit. For example: A half cup of raw red pepper has about 95 mg of vitamin C.

If you dont like any of that stuff, you can eat a medium potato and a cup of red cabbage to get your daily dose. If youve got guava around, youll get 206 mg from eating just one!

Make sure to eat a few servings of fruits and vegetables each day, and youll likely have more than enough vitamin C to make your body happy. Its important to know that research doesnt show any benefit of supplementing with vitamin C beyond the recommended daily intake, says Greaves. So more is definitely not better!

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Effects Of Mega Doses Of Vitamin C

According to a study, researchers have treated cancer patients with high dosages of vitamin C, through IVC therapy . Scientists gave cancer patients up to 100g of vitamin C a day! Thats 100,000 mg. 100 times more vitamin C than a dosage of 1,000 mg or 100,000 times the recommended daily intake of vitamin C Thats a huge dose. So, what happened to these patients?

Regarding cancer, researchers observed:

  • improvement in the quality of life,
  • improved tolerance of conventional therapy,
  • deterioration in clinical condition, in the absence of vitamin C dosage.

The side effects of mega dosages of vitamin C seem to be minimal, though. Patients experienced symptoms of Jarisch-Herxheimer reaction. This is a reaction of the body to endotoxins produced by the necrosis of harmful cells. Fever, chills, strong body odor, and pimples may be other side effects.

Dont forget that these side effects happened to cancer patients, after megadoses of vitamin C. Symptoms resolved after 2 to 3 hours, after injection with vitamin C.

On the other hand, therapy with high dosages of vitamin C may:

  • stabilize cancer,
  • have anti tumor activity in some cases,
  • help patients regain strength, even walking again

Intravenous Vitamin C Plus Thiamine With Or Without Hydrocortisone In Critically Ill Patients Without Covid

Can Vitamin C Cause Kidney Stones? How Much Vitamin C Per Day Should You Take?

Two small studies that used historic controls reported favorable clinical outcomes in patients with sepsis or severe pneumonia who received a combination of vitamin C, thiamine, and hydrocortisone.8,9 Subsequently, several randomized trials in which patients received vitamin C and thiamine to treat sepsis and septic shock showed that this combination conferred benefits for certain clinical parameters. However, no survival benefit was reported. Two trials observed reductions in organ dysfunction 10,11 or the duration of shock12 without an effect on clinical outcomes. Three other trials, including a large trial of 501 sepsis patients, found no differences in any physiologic or outcome measures between the treatment and placebo groups.13-15

See for a list of clinical trials that are evaluating the use of vitamin C in patients with COVID-19.

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Can A Vitamin C Supplement Really Keep You From Getting Sick

Despite its popularity as a remedy for the common cold, theres actually no evidence to suggest that a large dose of vitamin C can actually prevent one or any other type of illness, for that matter.

And while you may have heard that a large dose of vitamin C can slightly reduce the duration of a cold, this only applies if you take that large dose every singleday of the year even when youre not sick. This means that if you rip that vitamin C packet open after your symptoms begin, theres no evidence to suggest itll actually shorten the length of your cold.

As it turns out, boosting your immune system is more complicated than just downing a packet or a pill. And while vitamin C does play an important role in supporting your immune system, it doesnt take megadoses like the ones found in supplements which often contain 1667% more vitamin C than you actually need every day.

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How To Get More Vitamin C In Your Diet

This antioxidant super-nutrient is found in a variety of fruits and vegetables. Yet, according to dietary intake data and the 2020 U.S. Dietary Guidelines, many adults don’t get enough vitamin C in their diets. This is especially true of smokers and non-Hispanic black males, according to research done by Jeff Hampl, PhD, RD, and colleagues at the University of Arizona.

The foods richest in vitamin C are citrus fruits, green peppers, strawberries, tomatoes, broccoli, white potatoes, and sweet potatoes. Other good sources include dark leafy greens, cantaloupe, papaya, mango, watermelon, brussels sprouts, cauliflower, cabbage, red peppers, raspberries, blueberries, winter squash, and pineapples.

Here are eight easy ways to work more fruits and veggies into your diet each day:

  • Add pureed or grated fruits and veggies to recipes for muffins, meatloaf, and soups.
  • Keep cut-up fruits and veggies on hand so they are ready for a quick snack.
  • Frozen fruit slices make a cool summer treat.
  • Include dark lettuce, tomatoes, and shredded broccoli slaw on all your sandwiches and wraps.
  • Eat raw veggies with hummus, low-fat dips, and salsas.
  • Add fresh or frozen berries to muffins, pancakes, cereal, and salads.
  • Throw a handful of dried fruit on top of your cereal or in a baggie with nuts for an easy snack.
  • Enjoy a glass of vegetable juice as a filling and low-calorie mid-afternoon snack.
  • Show Sources

    Phyo K. Myint, MRCP, department of public health, University of Cambridge, England.

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    Mg Of Vitamin C A Day

    I have a friend that takes 20,000 mg of Vitamin C everyday. He said that he has never been sick, not even a cold or cough, since hes been taking the supplment. Is this dangerous. Theres reasearch that shows high quantities of Vitamin C helps slow down HIV. I dont know where the documentation is anymore. Can someone tell me where I can get this in a powder form for the best price? Each scoop should contain 10,000 mg of Vitamin C.

  • anthrax said:31-Oct-2002 06:13 PM

    20,000 mg is way too muchyou wont absorb it allit is just a waste of money

  • Sanosuke said:31-Oct-2002 06:19 PM
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    Can You Take Vitamin C Supplements During Pregnancy

    9 foods that pack more Vitamin C than an orange

    You might be wondering if it’s safe or necessary to take vitamin C supplements while pregnant, especially if you’re hoping to boost your immunity during cold and flu season. However, for most pregnant women, it’s relatively easy to get the recommended amounts of vitamin C through diet and a good prenatal vitamin.

    The latest research on taking vitamin C while pregnant is mixed and limited, and the World Health Organization does not recommend adding an additional vitamin C supplement to your prenatal. If you’re concerned that you’re getting enough vitamin C through diet, ask your practitioner if a vitamin C supplement is right for you.

    From the What to Expect editorial team and Heidi Murkoff, author of What to Expect When You’re Expecting. What to Expect follows strict reporting guidelines and uses only credible sources, such as peer-reviewed studies, academic research institutions and highly respected health organizations. Learn how we keep our content accurate and up-to-date by reading our medical review and editorial policy.

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    How Many Tablets Of 250 Mg Vitamin C Is Equal To 1 Gram A Day

    It takes 4 250 milligram tablets of vitamin C to make 1 gram per day. A gram is equal to 1,000 milligrams, and 250 milligrams multiplied by 4 is equal to 1,000 milligrams.

    In the metric system of measurements, the prefix milli means a thousandth of the base unit, which in this case is the gram. To convert from milligrams to grams, divide grams by 1,000, and vice versa. Conversion between grams and milligrams can become necessary when a dietary supplement is expressed in terms of the total recommended daily intake by health professionals, but at the drugstore it is available only in tablet form that is measured in milligrams. In that case, the individual has to determine how many tablets are needed to meet the daily required dosage of the supplement.

    Linus Pauling Institute Recommendation

    Combined evidence from metabolic, pharmacokinetic, and observational studies, and from randomized controlled trials supports consuming sufficient vitamin C to achieve plasma concentrations of at least 60 mol/L. While most generally healthy young adults can achieve these plasma concentrations with daily vitamin C intake of at least 200 mg/day, some individuals may have a lower vitamin C absorptive capacity than what is currently documented. Thus, the Linus Pauling Institute recommends a vitamin C intake of 400 mg daily for adults to ensure replete tissue concentrations an amount substantially higher than the RDA yet with minimal risk of side effects.

    This recommendation can be met through food if the diet includes at least several servings of vitamin C-rich fruit and vegetables as part of the daily recommended fruit and vegetable intake . Most multivitamin supplements provide at least 60 mg of vitamin C.

    Older adults

    Copyright 2000-2021 Linus Pauling Institute

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    In Conclusion Is 1000 Mg Of Vitamin C Safe

    In general, the daily consumption of 1,000 mg of vitamin C is pretty safe. There are no side effects for most people. Certainly, people on medication should consult their health care provider, before taking any supplement.

    Its a good idea to boost vitamin C intake, especially in the winter, as vitamin C seems to be beneficial against the flu and common cold. It may boost the immune system.

    Moreover, we should take at least 1,000 mg of vitamin C during the summer, as well. Vitamin C naturally boosts collagen production, protecting us from skin aging and reliving us from sunburns! Also, it helps us burn body fat and lose weight!

    Certainly, eating foods high in vitamin C is the best way to boost your daily intake. But, boosting vitamin C intake from supplements could be beneficial as well. Especially, during certain times of the year!

    Youll find a wide variety of vitamin C supplements on iHerb. Click here to get a $5 discount , or a %5 discount on your order.



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