The answer depends on diet, deficiency risk and the specific concern. Collagen and selected nutrients are commonly used, but no supplement replaces sunscreen, balanced nutrition or dermatologic care.

Biotin is important for normal metabolism, but supplementation is most clearly relevant when intake or deficiency is an issue. Unexplained hair loss should be evaluated for other causes.

Hair, skin and nails change slowly, so research often evaluates products over weeks or months. Results vary and are not guaranteed.

Some people use both. Review total ingredients across products and follow directions. If you have allergies or medical conditions, check suitability with a healthcare professional.