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There are, however, two studies that we can call on: Pentadecapeptide BPC 157 Interactions with Adrenergic and Dopaminergic Systems in Mucosal Protection in Stress (link) This study wasnt designed to find the comparison between two administration methods, but it did look at how different systems of the body would affect these two methods

3 International Journal of Molecular Sciences (PubMed)GHK-Cu stimulation of collagen, elastin and dermal matrix synthesis in skin models

TB-500 -4, TB-500

Applied to your skin and absorbed, the peptides send signals to repair tissue breakdown and tighten collagen, smoothing your wrinkles

A PubMed search for the two compound names in combination returns no primary research articles characterizing co-administration in any model system