About 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.
What PABA supports
- Legacy B-complex ingredient with no established clinical benefit
How much PABA to take
Clinical studies typically use 30–400 mg of PABA. Common supplement doses range from 30-400 mg/day. Higher doses (>8g) are associated with liver toxicity. No established therapeutic range from RCTs.
- Effective range
- 30–400 mg
Clinical evidence
Limited clinical evidence. No RCTs support oral PABA for any health outcome; anti-graying claims are based on unreplicated 1940s research
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