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Dietary Supplements: Some formulations may include GHK-Cu in capsule form, though injectable and topical applications remain the most effective

The first step is mediated by -glutamylcysteine synthetase (GCLC), which catalyzes the -amide bond between the -carboxyl group of glutamate and the amino group of cysteine to form -glutamyl-cysteine (-Glu-Cys)

For example, if you look on Clinicaltrials.gov, there are only two studies that even mention BPC-157, says Cushman

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Bibcode:2000BBRC..269..366K

For best penetration, apply to slightly damp skin or layer with a humectant like hyaluronic acid