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I would let the vaccinators worry about this, not the patients

In rare cases, B12 injections can cause more serious side effects

Preserved lean muscle mass while reducing fat mass Studies showed that NNMT inhibition selectively reduced adipose tissue without negative effects on skeletal muscle mass, suggesting a favorable body composition profile

In a cohort study involving 8,067 patients with T2D who participated in the National Health and Nutrition Examination Survey, low and high serum vitamin B12 levels were associated with a higher risk of cardiovascular disease mortality [69]
