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A study of a finished formulation cannot attribute an effect to any single ingredient in it, and a great deal of secondary writing about GHK-Cu does exactly that
So, the B12 in the serum is OK, but in the brain, it is low
10.1007/s13244-017-0572-3 142 TshionyiM.ShayE.LundeE.LinA.HanK
For a broader view of peptide safety considerations, see the peptide safety guide
The peptide binds to growth hormone receptors, triggering fibroblast proliferation and collagen synthesis, rebuilding structural tissue following injury
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