It can throw your readings way off, Dr. Raj says.
Certain lifestyle habits, medications, and foods and drinks can have a negative impact on your vitamins. Here's what to know.
If you're worried about the supplement, this doctor has all the answers.
We asked experts about the natural ingredient's effect on breast size, reproductive health and the (very real) potential risks.
The essential mineral is a heart health powerhouse.
A recent study found that 90% of melatonin supplements don't contain the amount of melatonin they claim to include. Here's how to check what's actually in your bottle.
Magnesium citrate, magnesium hydroxide and magnesium L-threonate all have their specific uses. Here's what to know.
Smoothie and supplement companies might get your hopes up, but "medically, it doesn’t really make sense".