Iron supplements are particularly infamous for causing constipation, nausea, and stomach pain. Vitamin C in high doses can ...

Discover how exceeding 2,000mg of vitamin C daily triggers digestive distress, kidney stones, and other surprising health ...

"These suggested that combining vitamin C and niacinamide might lead to formation of a compound called nicotinic acid, which can cause irritation, flushing, and redness in the skin." But those ...

Based on evidence from various types of studies, these experts recommend a vitamin C intake of 400mg daily for adults – ...

If you ask virtually any dermatologist or skin expert out there about powerhouse skin ingredients, we’d bet the big bucks that one of the best vitamin C serums would make the cut. In fact ...