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This phase is theorized to result from GHK-Cu's influence on metalloproteinases (MMPs), which act like a 'demolition crew' breaking down old, damaged tissue before the 'construction crew' rebuilds

A Oral GSH Supplementation Significantly Reduces HbA1c in Elderly Diabetic Patients Earlier reports suggest that the concentration of GSH decreases with age in healthy adults [17,26]

and in mice, a reduction in anxiety-like behavior in response to probiotic administration was demonstrated to be mediated by activity of the vagus nerve, which communicates directly between the gastrointestinal tract and the brain (Bravo 2012

However, they are not for everyone

Most of the studies with Ceramide AP test it as part of a multi-ceramide complex