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Some people have bodies that cant absorb as much vitamin B12 as usual, or they may have one or more chronic conditions that could affect vitamin B12 levels in their blood

GHK-Cu 100mg For Research Use Only GHK-Cu is a copper-binding tripeptide offered in lyophilized powder form

He describes it as a gastric pentadecapeptide synthesised from gastric juice, says its tolerated well even orally, and says injecting it at the site of an injury helps call platelets to that location (source)

Maddalena, G, Pellatt, AJ, Eluri, M, Parseghian, C, Aziz, KE, Alfaro, KD, Kell, R, Bent, AH, Huey, RW, Uppal, A, Konishi, T, Overman, MJ, Morelli, MP, Willis, JA, Shen, JY, Raghav, KS, Newhook, TE, Morris, VK, Dasari, NV, Kopetz, S