This is most often attributed to the GHK-Cu component
Most users tolerate them well, especially when taken with food and water
Schrijvers, D., Demeyer, G., Herman, A
Liposomal Glutathione Yeast Extract (90% Glutathione) 42.86% [Yeast Extract (India), Lecithin, Citric Acid], Pullulan, Lemon Juice Powder (Lemon/USA), Vitamin C, Hyaluronic Acid, Pectin, Enzymatically Modified Stevia (Sweetener), Natural Flavor (Natural Lemon Lime Flavor), Glycerin, Polysorbate 80, Beta-Cyclodextrin, Other Processed Edible Oils and Fats (Malaysia), Modified Starch, Prolastin (Elastin), Anhydrous Citric Acid, Milk Thistle Extract Powder, Carotene, Low Molecular Weight Fish Collagen, Milk Ceramide, Vitamin E 50% Mixture (dl-alpha-Tocopheryl Acetate, Modified Starch, Glucose Syrup Powder, Silicon Dioxide), Biotin
That said, dedicated studies examining CJC-1295 specifically for injury healing are limited