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What we have is a lot of rat data

Pickart estimated lethal dose at approximately 22,500 mg for humans (300-fold above effective doses), with animal LD50 studies in mice showing 8 mg per 25g mouse (320 mg/kg, translating to ~22,400 mg for 154 lb human)

So the 100% figure is an assumption from how systemic administration generally behaves, not a measured number for this compound

Abstract Antibiotic misuse is considered a global threat due to drug-induced microbial resistance and disruption of vital biochemical and physiological processes

Common deficiencies in B vitamins, vitamin C, magnesium, zinc, and essential fatty acids have been linked to fatigue and slower recovery in CFS patients