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best place to give a vitamin b12 injection Site: Administering B12 Shots Optimal B12 Injection Sites for
Description
Vitamin B12 is water-soluble, so your body excretes what it doesnt use

Regulatory Context: In the U.S., GHK-Cu injections can only be obtained via compounding pharmacies and physician prescriptions

Liu, T., Liu, Y., Zhao, X., Zhang, L., Wang, W., Bai, D., Liao, Y., Wang, Z., Wang, M., & Zhang, J
Nature Health , 2026
