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I injured my back after falling down two flights if stairs when I was young and have lower back problems & worn facet joints worse on the right

Collagen and matrix biology The first published paper documenting collagen synthesis stimulation by GHK-Cu appeared in 1988: fibroblast cultures increased collagen output when exposed to GHK-Cu at concentrations as low as 10 M, with peak activity around 1 nM (Maquart et al., FEBS Letters, 1988)

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10.1016/S0891-5849(99)00275-0 Free Radic Biol Med