Vitamin C may be effective for several different uses. However, there is much controversy about some uses, such as for the common cold (see Does Vitamin C Work? for more information).
Both RDAs (recommended dietary allowances) and UL (tolerable upper limit) dosing recommendations are available for vitamin C. Some people (such as smokers) may need more than others.
(Click Vitamin C Dosage for more information.)
Most people do not experience side effects with vitamin C (at normal doses). However, some people may experience side effects (especially with high doses), including, but not limit to:
(Click Vitamin C Side Effects to learn more, including potentially serious side effects that you should report immediately to your healthcare provider.)
Vitamin C can potentially interact with a few medications (see Vitamin C Drug Interactions).