Fulvic acid

Tier 3 — weak evidence · Mineral absorption · Antioxidant · Gut

A soil-derived substance marketed for improved mineral absorption and "detox." No human trial evidence supports any health benefit whatsoever. Comes with a documented risk of heavy metal contamination including lead, arsenic, and mercury. Product quality and purity vary enormously between brands. Save your money for supplements with actual evidence.

Dose: No evidence-based dose; quality and purity vary widely; contamination risk