Diavolu_turcu
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yo check this out
pubmed.ncbi.nlm.nih.gov
Inhibition of 5 alpha-reductase activity in human skin by zinc and azelaic acid - PubMed
The effects of zinc sulphate and azelaic acid on 5 alpha-reductase activity in human skin were studied using an in vitro assay with 1,2[3H]-testosterone as substrate. When added at concentrations of 3 or 9 mmol/l, zinc was a potent inhibitor of 5 alpha-reductase activity. At high concentrations...