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is ghk cu better topically or injected GHK-Cu Topical vs Injection Introducing Copper Peptides π΅ I'm
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Science 356(6339):722726
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Signs of Vitamin B12 Deficiency Vitamin B12 deficiency can develop gradually, and symptoms may range from mild to more noticeable

10.1038/ni.3655 Nat Immunol

Aggregated peptides are essentially non-functional
Gomes, B.D
