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Injectable GHK-Cu is FDA Category 2 restricted in the United States and cannot be legally compounded for injection
The primary risk with GHK-Cu is sourcing quality, as unregulated peptide products may contain impurities that cause reactions attributable to contamination rather than the peptide itself
Additionally, thyroid hormones were reported to affect spermatogenesis, Leydig, and Sertoli cells
An overview of the major challenges and corresponding solutions is illustrated in Figure 5
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