Vitamin B12 is typically well-tolerated, but in very rare cases, there are serious side effects to be aware of. Learn more ...

What happens if your body has too much vitamin B12? Read on to find out the dangerous side effects of having excessive levels ...

Many people use zinc supplements to boost immunity or improve acne symptoms. Learn how much zinc is safe for you, and what to watch for if you use it long term.

Medically reviewed by Alex Yampolsky, PharmD Zinc is a mineral found in food and taken as a supplement. It can help with cold ...

Berberine side effects may include digestive problems, low blood sugar and blood pressure, headaches, and more. Ask your doctor if berberine is safe for you.

Potential side effects caused by the popular exercise supplement creatine include weight gain, nausea, diarrhea, muscle ...

When diet and absorption is insufficient, iron supplements act as a safety net. While iron supplements are effective in ...

If you're considering a vitamin B12 supplement because of certain dietary restrictions, medical conditions or your age, this ...

Androstenedione is one of those supplements that was peddled to athletes for years as a quick path to bulging muscles and high testosterone levels, but it comes with some serious side effects. Also ...

Does your performance supplement contain a side of the main ingredient in Viagra? According to the FDA, it might. Recent alerts from the Food and Drug Administration have warned that supplements ...

Research shows many benefits in the use of creatine supplements in women. Experts explain how to use creatine, what creatine ...