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This test uses a radioactive form of B12 to see if your body has enough intrinsic factor

doi: 10.1080/1028415X.2022.2146843 Summary Keywords intermittent fasting, immune system, immunomodulatory effect, metabolic syndrome, obesity Citation He Z, Xu H, Li C, Yang H and Mao Y (2023) Intermittent fasting and immunomodulatory effects: A systematic review

Brezun, J

Two weeks later, still feeling sluggish, I went to see my internist, who gave me a full physical, some homeopathic cures of her own, and an injection of vitamin B12 in my butt

doi:10.1016/s1383-5742(00)00050-8

Its a pentadecapeptide, which means that its made up of 15 amino acids held together by peptide bonds