If you are weighing B12 injections against oral supplements, the right choice depends less on which method is "stronger" and more on your body, your diet, and whether you actually have a deficiency
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doi: 10.1016/S0140-6736(18)30726-8 101 NahraRWangTGaddeKMOscarssonJStumvollMJermutusLet al
Consecutive measurements were detected under basal conditions and after the sequential addition of 10 mM glucose (inhibiting mitochondrial ATP synthase), 2 M oligomycin (revealing cellular maximum glycolytic capacity), and 50 mM 2-deoxy-glucose (2-DG, a glucose analog inhibiting glycolysis through competitive bind to glucose hexokinase)
PubMed Jastreboff, A.M., Aronne, L.J., Ahmad, N.N., Wharton, S., Connery, L., Alves, B., et al
Q: What makes B12 injections better than oral supplements