It is a tripeptide composed of glutamate, cysteine, and glycine, with a unique gamma peptide bond between the glutamate side chain and cysteine that protects it from normal peptidase degradation
10.1111/j.1460-9568.2006.05142.x 196
Vitamin B12 injection effects can include: Soreness or slight bruising where the needle goes in A warm feeling right after the injection Mild headache in some people, which usually passes quickly Rare allergic reactions, which is why a health check happens first Vitamin B12 injection painful is a common worry, but most people describe it as a quick pinch rather than anything severe
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Do not freeze the formulation as upon freezing, it lost its efficacy