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The Role of N-acetyl cysteine (NAC) N-acetyl cysteine (NAC) is a precursor to glutathione, meaning it helps replenish glutathione levels in the body

5% of all skin cancers, respectively) [87]

Additionally, clinical trials using nicotinamide for glaucoma neuroprotection have primarily tested a 3 g/day dose, which is 150 times the recommended daily intake (~20 mg/day), raising concerns about long-term safety in human use

Andrologia 51:e13267

Baseline plasma IGF-I concentrations were similar in both groups (mean +/- SEM, 106 +/- 9 micrograms/L), approximately half that observed in healthy young adults

Acknowledgements This work was supported by National Natural Science Foundation of China (82170873, 82371424), and Tsinghua University Spring Breeze Fund (20211080005)