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
DEXA scans to monitor bone density
"Once you get a little bit of momentum, once you lose a little bit of weight, you're sleeping better, you have more energy, you can go to the gym, you can eat better and then that's that positive flywheel," Reitano said
Limited proteolysis in the study of protein conformation, in Proteolytic enzymes: Tools and targets (Springer), 253280
If you are walking up to the pharmacy counter without any insurance coverage, you might experience severe sticker shock