The carrier and any preservatives are part of the formulation question and vary across self-reported recipes
That means ruling out celiac disease, anemia, bleeding, and true IBD
Landry, D.A
View Study [7]"Skin Care Benefits of Copper Peptide Containing Facial Cream (as reviewed in Pickart & Margolina 2018)" Leyden J, Stephens T, Finkey MB, Appa Y, Barkovic S, 2002 Finding: A facial cream containing GHK-Cu applied for 12 weeks to 71 women with photoaging increased skin density and thickness, reduced laxity, improved clarity, and reduced fine lines and wrinkle depth
During the application period, the peptide stimulates gene expression related to collagen production, elastin synthesis, and growth factor secretion, creating a regenerative environment within hair follicles
There is no need to aspirate for a subQ injection