Can i take vitamin c for a cold?

Can taking vitamin C shorten a cold?

Taking vitamin C regularly before symptoms appear may shorten a cold by about 8% in adults and 14% in children. It does not reliably prevent colds or reduce their severity once symptoms start.

What dose works best and when should I start?

Most studies use 200 mg to 2 g per day. Benefits appear only when supplementation begins weeks before exposure. Starting at the first sign of symptoms shows little effect.

What are the risks of taking high-dose vitamin C?

High doses above 2 g per day can cause stomach upset, diarrhea, and kidney stones in people who already have risk factors. People with kidney disease or iron overload disorders should avoid large amounts.

How does vitamin C compare to other cold remedies?

Vitamin C offers modest shortening of illness compared to zinc lozenges, which may reduce duration by 33%. Over-the-counter pain relievers handle symptoms more reliably than vitamin C.