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Health Canada explicitly warns that unauthorized injectable peptides bypass safety reviews and may contain contaminants, incorrect doses, undisclosed ingredients, and high-risk components

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GHK-Cu is for research purposes only and is not intended for human or animal use, diagnosis, treatment, or consumption

So an effective way to stop the formation of 5-alpha reductase (and reducing DHT) is to Compete with the coenzyme NADPH, or Block NADPH These are two mechanisms of direct 5-alpha reductase inhibition or for the lay person reducing 5-alpha reductase by stopping it from forming