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The systemic (subcutaneous) use described here is unproven and unapproved benefits seen with topical or in-vitro GHK-Cu should not be assumed to transfer to injection, and the safety of injected copper-peptide is not established
However, try to avoid taking it at the same time as high-calcium meals or dairy products, as calcium can sometimes compete with zinc for absorption
Journal of Biological Chemistry 283 , 2018620197, doi: 10.1074/jbc.M803020200 (2008)
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