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This page keeps those checks beside the practical product path so readers can distinguish research context from a personal treatment decision

IMPORTANT TIPS: FOR COSMETIC TOPICAL USE ONLY STORE AT ROOM TEMPERATURE - DO NOT REFRIGERATE AVOID MIXING INTO: --- Vitamin C products (the blend may become unstable) --- Hydroxy Acids (GHK is fragile and may break down) --- 3% VIP Luxury Products (these already contain a high concentration of GHK) --- Sunscreens (zinc oxide products, etc) All other cosmetic ingredients will work well - Product must be diluted (or blended into another product) before use

This is the strongest peer-reviewed human evidence in the T4 family, although the formulation tested was full-length T4, not the TB-500 fragment used in commercial peptide products

DHT inhibition Finasteride blocks the enzyme 5-alpha reductase, which converts testosterone to dihydrotestosterone (DHT)