doi:10.1016/j.jmb.2011.12.046
The variable weight value (VIP) in Orthogonal Partial Least Squares-Discriminant Analysis is a measure of the expression pattern of each metabolite, the explanatory ability and depth of influence on the categorical discrimination of samples in each group, to explore meaningful differential metabolites, and then use the T-test to verify whether the differential metabolites between groups are significant
What science exists for GHK-Cu is all rather positive (a 2018 analysis of the science concluded the peptides actions appear to be health positive, saying it boosts collagen, improves tissue repair and has powerful cell-protective actions, including multiple anti-cancer and anti-inflammatory actions)
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Nguyen V, George T, Brewster GS