Vitamin B12 is a water-soluble vitamin that acts as a cofactor for methionine synthase and methylmalonyl-CoA mutase, supporting nerve function, red blood cell production, and DNA synthesis
Vitamin B1, B6 and Cyanocobalamin Injection Treatment of severe vitamin B12 deficiency, particularly, and vitamin B1 and B6 deficiencies, which could cause neurological complications of various origins (e.g., absorption deficiency, insufficient diet, convalescence)
In contrast, B12 injections for weight loss deliver nutrients directly into the bloodstream, offering faster and more reliable results
Nutrition Reviews, 62(6), S3S12
However, this position doesnt take adenosylcobalamin into account