Oral supplements are available over-the-counter, while injections are typically prescribed by a healthcare provider for severe deficiencies
Department of Health and Human Services
Side effects of 4-week oral glutathione (1 g/day) in clinical trials included [91]: Flatulence Loose stools Flushing Weight gain Side effects of higher doses (up to around 150 mg/kg/day) in people with cystic fibrosis included chest tightness, diarrhea, and fever
Niacinamide does not significantly accelerate skin cell turnover, so breakouts associated with it are more likely due to irritation, sensitivity, or product-related factors rather than true purging
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