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What is GHK-Cu peptide
A skeptic would say that picomolar collagen stimulation in cell culture does not automatically translate to visible skin firming in a 50-year-old human face, and they would be technically correct
If dietary protein intake is insufficient, particularly glycine and proline which are collagens primary building blocks, the anabolic signaling has limited raw material to work with
Here's the honest, evidence-based answer, and who really benefits from them
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