Medically reviewed by Mary Choy, PharmD Key Takeaways High doses of vitamin C, especially above the tolerable upper limit of ...

This popular seasonal spice is generally safe when added in small amounts to beverages and baked goods, but it may lead to some unwanted and potentially serious side effects if consumed in large ...

Caffeine offers some real health benefits—but not if you go overboard. Here’s how coffee, energy drinks, and other caffeine ...