Lifestyle

Brittle, ridged, or slow-growing nails are often blamed on nail polish or filing habits — but micronutrient status plays a bigger role than most...

Hair thinning has real, testable nutritional causes in some people, and no nutritional cause at all in others. Here's what the research actually shows...

Collagen supplements are everywhere, but does the science back the skin and joint claims? Here's what the clinical trials actually show.