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Maybe indirectly, but it isn't a substitute for testosterone treatment

2005 Dec;82(6):1283-91

Laboratory studies evaluate GHK-Cu in relation to oxidative-stress markers and cellular stress-response pathways

The FDA issued a warning letter to an Indian API manufacturer after inspectors found that the company knowingly accepted deliberately mislabeled raw materials to bypass licensing requirements, failed to perform required identity testing, and relied on unverified supplier documentation before using the materials to manufacture APIs shipped to the United States

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Yes, it is generally safe to take L-cysteine or NAC daily at recommended doses (usually 600-1,200 mg/day for NAC), but long-term use should be monitored by a healthcare provider, especially if you have kidney or liver conditions