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The "bpc 157 vs tb 500" question rarely has a single answer in research terms, because the two are typically studied for different mechanistic questions

By down-regulating TGF-1, AHK-Cu can directly reduce the impact of DHT and protect hair follicles from negative stress [2].

Like GHK-Cu, AHK-Cu delivers copper ions to cells

And you have had both

[2] Choline chloride serves as an essential substrate for phosphatidylcholine and betaine formation, thereby enhancing bile-dependent lipid emulsification and acting as an osmolyte that maintains hepatocyte membrane integrity under oxidative stress

If ease of use matters most, the BPC spray is a great pick