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Furthermore, the use of glutathione precursors (NAC, glycine and glutamic acid) as supplements has been shown to be well tolerated, with no specific time limit for how long you can use them
PubMed Sikiric, P., Hahm, K.B., Blagaic, A.B., Tvrdeic, A., Pavlov, K.H., Petrovic, A., Kokot, A., Gojkovic, S., Krezic, I., Drmic, D., Rucman, R., & Seiwerth, S
Metformin-induced vitamin B12 deficiency can cause or worsen distal symmetrical, autonomic and cardiac neuropathy
Short Answer: There is no strong direct evidence that DSIP improves muscle recovery, exercise recovery, soreness, strength restoration, or athletic performance in humans