https://kotsuhealth.com/ A Japanese orthopedic surgeon checks what the research actually says about staying strong, mobile and young — muscles, bones, joints, connective tissue, skin and hair. en https://kotsuhealth.com/articles/biotin-hair/ https://kotsuhealth.com/articles/biotin-hair/ Thu, 15 Oct 2026 09:00:00 +0900 Biotin has helped hair only in people with a deficiency or an underlying condition. In everyone else the evidence is missing — and high doses can distort important blood tests. https://kotsuhealth.com/articles/collagen-skin-joints/ https://kotsuhealth.com/articles/collagen-skin-joints/ Thu, 15 Oct 2026 09:00:00 +0900 Pooled trials say collagen helps skin, but the independent, high-quality ones don't. For joints, the benefit is short-lived and the evidence weak. A surgeon reads the fine print. https://kotsuhealth.com/articles/grip-strength/ https://kotsuhealth.com/articles/grip-strength/ Wed, 14 Oct 2026 09:00:00 +0900 Weaker grip goes with shorter life in huge studies across the world. What that does and does not mean, and what you can actually change.