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Cancer Cell 18 , 553567 (2010)

Due to its short half-life, it is used in three subcutaneous injections per day

The penetration question matters because it points to something Dr Loren Pickart - the biochemist who discovered GHK-Cu - understood from the beginning
Cancer prevention Studies are mixed on whether vitamin B12 in combination with folate and B6 can reduce cancer risk, and it may increase risk of lung or colorectal cancers