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The honest boundary is that even the coherent pairing is a mechanistic hypothesis with no human validation, so the most defensible research posture is to study the single compound at its documented dose first, and treat any combination as a further, clearly-labelled research question rather than a default

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In addition to its effects on the intercellular matrix, GHK-Cu may also have antioxidant and anti-inflammatory properties

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or D or L norleucine, , lysine, arginine, norvaline, ornithine, or S-benzyl cysteine II = a D or L cysteine, phenyalanine, aspartic acid, glutamic acid, serine, tyrosine, glycine, homocysteine, homoserine or homophenylalanine amino acid residue