does ghk-cu lose effectiveness over time tolerance desensitization Really Work? 40 Years of Research Reviewed How Much GHK-Cu Should You
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Psychiatry 26 (9), 47024718

Clinical status should be closely monitored, and appropriate therapy should be initiated

This process can compromise physical performance, slow down metabolism, and reduce overall resilience

The copper-mediated inhibition remains localized, potentially reducing follicle sensitivity to DHT without affecting hormones elsewhere in the body
PMID: 22 KohenA

Thats exactly the case in point for the humble vitamin B12
