PABA

A compound structurally part of the folic acid molecule, historically grouped with B-vitamins (sometimes called Vitamin Bx). Found in some B-complex formulas as a legacy ingredient. Claims for anti-graying and skin health trace back to a single 1941 study that was never replicated. No meaningful RCTs support oral supplementation for any health outcome. Can cause liver toxicity at high doses (>8g/day). Not an essential nutrient — no RDA established.