Find out how vitamin C and vitamin D function in your body, their role in immune defense, and how much you may need for optimal support.

Since vitamin C is a water-soluble vitamin, any excess is excreted in the urine in a few hours. Current U.S. recommendations call for 75 mg of vitamin C per day for adult women and 90 mg per day for ...

Vitamin C may help shorten how long cold symptoms last and their severity when used before cold symptoms start, but not after a cold begins.

Vitamins D and C both play important roles in immune health, but will either prevent you from getting sick? Here's what experts want you to know.

Does vitamin C help prevent a cold? And can taking antibiotics help you get over one? Doctors address common myths. (Getty Images) Respiratory virus season is officially here in the U.S., making it a ...

When cold strikes in, vitamin C becomes a go-to supplement for many. Some start loading up oranges, some turn towards supplements. Even if vitamin C is important for the immune system, does taking ...

Medically reviewed by Susan Bard, MD Use vitamin C in the morning and retinol at night to avoid skin irritation.Vitamin C protects against photodamage and should be applied before applying ...

Vitamin C doesn’t just belong in skincare products—it works even better when you eat it. Scientists discovered that vitamin C ...

’Tis the season…to catch a cold or the flu. Vitamin C is touted as one of the best immune-boosting supplements on the market, which explains why searches around “vitamin C deficiency” have spiked by 1 ...

In today's world, vitamin supplements are everywhere, and it seems like there's one for just about everything. But are all these pills and powders really necessary, or could some actually be doing ...