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Vitamin B-12 injections are administered to elevate B-12 levels in individuals who are deficient

(Source) When this enzyme is present in great concentration within fat cells and is highly expressed, obesity is inevitable: In the study by Kannt and colleagues, NNMT expression is increased ~2-fold in subcutaneous and omental adipose tissue of type 2 diabetic subjects (men and women), compared to healthy controls Importantly, interventions that increase insulin sensitivity, such as exercise and bariatric surgery, also decreased expression of NNMT in adipose tissue For this reason alone, scientists have been interested in every possible method for inhibiting NNMT expression: We report that NNMT expression is increased in [white adipose tissue (WAT)] and liver of obese and diabetic mice

There does not appear to be enough evidence that vitamin B12 supplementation can reduce joint pain

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Whatever fraction is absorbed systemically appears more slowly and at lower peak concentrations than after injection, smoothed by the absorption process