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First, the effect is enzymatic and cumulative you are shifting a metabolic set-point over days and weeks, not triggering an acute hormonal event, which is why steady daily exposure matters more than any single large dose

Studies show that methylcobalamin vs cyanocobalamin might be better for your brain and nerves

For instance, a study by Grace et al., on lambs receiving a single 2 mg subcutaneous B12 injection demonstrated significant increases in serum and liver B12 concentrations for up to 24 days compared to untreated animals (2)

This guide gives you the knowledge and confidence to take on this health-boosting task independently