Medically reviewed by Mary Choy, PharmD Key Takeaways High doses of vitamin C, especially above the tolerable upper limit of 2,000 mg per day, can lead to serious side effects such as kidney stones, ...

Medically reviewed by Patricia Mikula, PharmD Key Takeaways Tablets contain the most accurate dose of vitamin C and are the ...

Vitamin C supports immunity and skin health, but excessive intake can cause kidney stones, iron overload, enamel erosion, ...

While many believe high-dose Vitamin C is harmless, excessive intake can harm kidneys by converting to oxalate, potentially causing stones and failure ...

The relationship between vitamin C dosage and its effects on the duration of the common cold symptoms may extend to 6-8 grams per day. Dozens of animal studies using different animal species have ...

Now that flu season is here, a lot of people are stocking up on vitamin C in hopes of warding off a cold. At the first sign of a sniffle, they start downing mega-doses of the vitamin. Is this really ...

Vitamin C is a popular supplement, but it can interact with other supplements and medications like vitamin B12, iron, and ...

Q: I’ve been taking vitamin C for years to keep from getting a winter cold, and I think that it does help. A friend of mine thinks that it doesn’t really work and it’s “all in my head”. What do you ...

I’ve heard that vitamin C might be an alternative cancer treatment. What can you tell me about it? Answers from Timothy J. Moynihan, M.D. Interest in using very high doses of vitamin C as a cancer ...

Vitamin C supplements can be important for some due to dietary restrictions or a medical condition. There are many options available. Share on Pinterest Vitamin C, or ascorbic acid, is a water-soluble ...