ghk-cu peptide definition properties A face serum appears blue because the active ingredient, โGHK-Cuโ (copper peptide), is naturally a blue-colored powder, meaning its inherent color transfers to the serum when mixed in; this blue hue Lot #:Lot #: N9DSIP10/0729 laboratory-only ๐ค๐ข๐ป๐ฒ ๐ผ๐ณ ๐๐ต๐ฒ ๐ฏ๐ถ๐ด๐ด๐ฒ๐๐
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