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For broader literature on potential harms in related contexts see this review at PMC
Interestingly, in healthy men, low dietary Se intake (13 g/day for ~100 days) decreased serum, erythrocyte, and seminal plasma (but not sperm) Se concentrations, without influencing serum androgen, LH, and FSH concentrations, and decreased concentration and total number of sperm, increased the proportion of tailless sperm, but decreased the proportion of headless sperm (185)
GHK-Cu works through a different mechanism, supporting the follicle environment rather than blocking DHT
Sterne JA, Hernn MA, Reeves BC, Savovi J, Berkman ND, Viswanathan M, Henry D, Altman DG, Ansari MT, Boutron I, Carpenter JR
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