A fourth reason for your b12 shots not working is that you have something else going on
Kumar M
GHK-Cu and Extracellular Matrix Research Research confirms that GHK stimulates synthesis of collagen, dermatan sulfate, chondroitin sulfate, and the small proteoglycan decorin, while also modulating metalloproteinase activity and their inhibitors making it a key compound in extracellular matrix research
Ramsden CE, Zamora D, Faurot KR, MacIntosh B, Horowitz M, Keyes GS, et al
Barely any side effects, appetite to eat all day is gone
The best performance can be achieved using ultra-high-performance chromatography (increased resolution and shortened time of analysis in comparison to regular HPLC), a diode array detector (measurement of absorption at various wavelengths is useful to detect molecules differing in absorption maxima