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A 45-year-old with low testosterone and normal FSH may respond to peptides that support Leydig cell function, while a 40-year-old with high FSH suggests testicular failure where different tactics are needed
Purity testing measures one thing
But the ones that do carry a distinctive sulfur odor that comes from hydrogen sulfide gas
A major scientific review on GHK-Cu found that it can shift about a third of human genes toward a state of regeneration and repair
Barbara McGowan et al
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