Sodium Benzoate

Not a general brain booster for healthy people — all trials are in patients with diagnosed conditions. Won't replace approved Alzheimer's medications. No evidence it improves memory or focus in healthy adults. Combining it with brain stimulation (tDCS) showed no added benefit over either treatment alone. Not a detox supplement despite antioxidant effects in some studies.

• At high doses (above regulated food-additive levels), animal studies show oxidative stress, liver damage, and benzene accumulation in fat tissue — the opposite of its intended therapeutic effect.
• Animal studies show trans-generational developmental toxicity at high concentrations (2000 ppm), including delayed development and gut microbiota disruption passed to offspring.
• Widely used as a food preservative (E211), so consumers may unknowingly combine dietary exposure with supplement doses, potentially exceeding safe thresholds.
• Most cognitive benefit trials come from a single research group in Taiwan — independent replication is limited.
• Pregnant or breastfeeding individuals should exercise caution; pharmacokinetic models suggest minimal but non-zero infant exposure through breast milk.
• The acceptable daily intake is 5 mg/kg body weight as a food additive — therapeutic supplement doses (750–1000 mg/day) far exceed typical dietary exposure and require medical supervision.