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In the case of a GHK-Cu peptide serum, the manufacturer can integrate copper peptides into existing serum systems that already have stable textures and complementary ingredients
M., Oliveira GCM
The potential research applications are (nearly?) endless
Metabolism 52 , 699704 (2003)
Other ingredients to look out for that can lighten hyperpigmentation are vitamin C, niacinamide and salicylic acid, although salicylic acid is not as effective as alpha hydroxy acids like lactic acid
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