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You will draw up the prescribed amount with the provided insulin needle and syringe, then inject subcutaneously

Friese MA, Montalban X, Willcox N, Bell JI, Martin R, Fugger L

Transdermal film delivery: Thin adhesive films for targeted, discreet application that bypass the digestive tract for more direct absorption

The study showing copper peptides increased collagen in 70% of users versus 40% for retinoic acid suggests copper peptides may actually be more effective for collagen building specifically, though retinoids offer additional benefits (texture improvement, dark spot reduction) that copper peptides don't provide as strongly