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L-Citrulline shows preliminary evidence of blood pressure-lowering potential in pre-hypertensive and hypertensive adults

Understanding this tells you why route is not interchangeable and why "just inject it subcutaneously like BPC-157" misapplies the logic from a structurally different peptide

Some peptides do have FDA approval for specific indications

10.1016/j.isci.2023.108429 206 RajadnyaR.SharmaN.MahajanA.UlheA.PatilR.HegdeM.et al (2024)

[DOI] [PubMed] [Google Scholar] 192.de Bono J.S., Oudard S., Ozguroglu M., Hansen S., Machiels J.P., Kocak I., Gravis G., Bodrogi I., Mackenzie M.J., Shen L., et al

A double-blind placebo-controlled trial of fluoxetine for repetitive behaviors and global severity in adult autism spectrum disorders