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microneedling copper peptide ghk cu study I was wrong about peptides. Turns out the ingredient AND the delivery matter. The 2015 Li et al. measured GHK-Cu permeation through real human skin. On intact skin: near-zero. After InfiniWell PTD-DBM Peptide Hair Size:1000 mcg/ml - 10 ml x 3 peptide signalling research

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Fibroblasts are the primary producers of Type I collagen, the structural protein of tendons and skin

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Exosomes are more potent but less standardised