GHK-Cus skin data is mostly topical
If you were to take my opinion, there are better alternatives available in the market that can aid you in your weight loss journey, such as Semaglutide and 5-Amino-1MQ

Ingredients Water, 1-2-Hexanediol, Niacinamide, Glycerin, Helianthus Annuus (Sunflower) Seed Oil, Glutathione(6, 000 ppm), Methylpropanediol, Cetearyl Olivate, Hydrogenated Lecithin, Sorbitan Olivate, Polyacrylamide, Polyglyceryl-10 Stearate, Propanediol, Caprylic/Capric Triglyceride, C13-14 Isoparaffin, Butylene Glycol, Polyglyceryl-4 Caprate, Sodium Hyaluronate, Thujopsis Dolabrata Branch Extract, Bambusa Vulgaris Leaf/Stem Extract, Abies Sibirica Oil, Cryptomeria Japonica Leaf Extract, Chamaecyparis Obtusa Leaf Extract, Carbomer, Tromethamine, Polyglutamic Acid, Laureth-7, Citrus Unshiu Peel Extract, Ethylhexylglycerin, Cystoseira Tamariscifolia Extract, Lactobacillus Ferment, Stellaria Media (Chickweed) Extract, Malva Sylvestris (Mallow) Flower/Leaf/Stem Extract, Melissa Officinalis Leaf Extract, Alchemilla Vulgaris Extract, Hamamelis Virginiana (Witch Hazel) Leaf Extract, Morus Alba Bark Extract, Achillea Millefolium Extract, Veronica Officinalis Flower/Leaf/Stem Extract, Phyllanthus Emblica Fruit Extract, Primula Veris Extract, Mentha Piperita (Peppermint) Leaf Extract, Trichosanthes Kirilowii Root Extract, Panthenol, Sodium Ascorbyl Phosphate, Citric Acid, Tocopheryl Acetate, Glyceryl Linolenate, Glyceryl Arachidonate, Retinyl Palmitate, Biotin, Acetyl Hexapeptide-8, Copper Tripeptide-1, Thiamine HCl, Folic Acid, Pyridoxine, Oligopeptide-29, Oligopeptide-32, Cyanocobalamin, Palmitoyl Pentapeptide-4, Fragrance The manufacturer is responsible for the products ingredients

In patients with IBD, blood levels and enzymatic activity of DPP4, a key enzyme, were found to be significantly lower compared to healthy individuals or those with inactive diseases, and the degree of reduction correlated with disease activity