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It should be kept away from strong chelators (such as high levels of EDTA and related sequestrants), reducing sugars, thiol-bearing actives, and high concentrations of direct acids (for example ascorbic acid or alpha-hydroxy acids at low pH), all of which can compete for the copper center or disrupt the peptide-metal bond and shift the characteristic blue color toward brown or colorless degradation products
PMC 2837367
Matrixyl has a robust cosmetic trial record multiple randomized controlled trials confirm statistically significant reductions in wrinkle severity scores compared to placebo at concentrations as low as 0.001%
A "do not place on the list" recommendation is, for compounding purposes, very close to dispositive: pharmacies cannot lawfully source the ingredient as a bulk after FDA finalizes its decision
Chronic structural problems like advanced arthritis, complete ligament ruptures, or long-standing degenerative changes may show minimal or no response
