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Deficiency leads to nerve damage (neuropathy), which presents as numbness, tingling, or weakness

The Role of Vitamin B12 in Viral Infections: A Comprehensive Review of Its Relationship with the MuscleGutBrain Axis and Implications for SARS-CoV-2 Infection. Nutrition Reviews, 13 Nov

For example, a study conducted by the University of Oxford found that individuals with higher B12 levels had better cognitive function and a lower risk of developing Alzheimers disease

binds B12 in the stomach and protects it from stomach acid (also known as R-protein )

Some users report improved recovery and energy levels, though these effects are less well-documented than the body composition benefits

Increased intestinal permeability and tight junction alterations in nonalcoholic fatty liver disease (in Eng)