Experts explain how it works and what you need to know before trying it.

The word “supplement” is a broad category that includes vitamins and minerals (think: vitamin D and calcium) as well as botanicals (like turmeric and green tea extract).

GABA is a neurotransmitter that reduces brain activity, but it's also a supplement that could help with sleep.

Scientists at the American Museum of Natural History investigated old specimens that had been at the museum for decades and ...