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Both are copper tripeptides, but AHK-Cu uses alanine as its first amino acid while GHK-Cu uses glycine

Heres how: 1

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Used as donor PopPK structure for the retatrutide PK bridge the BW^0.8 allometric exponent is internally validated against retatrutide in Rosenstock 2023 arm pairs (4 mg ID2 at 108.3 kg vs 4 mg ID4 at 93.1 kg: predicted Cav,ss ratio 1.13, observed 1.18, 4.8% error), so the borrowing is tirz-prior, reta-confirmed rather than tirz-substituted

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