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Therefore, out of the many mechanisms that were suggested of how metformin interferes with the absorption of vitamin B 12 , metformin antagonism of the calcium cation and interference with the calcium-dependent IF-vitamin B 12 complex binding to the ileal cubilin receptor was the most accepted one

Combined with adequate protein intake (widely recommended at 1.2-1.6g per kg of body weight during GLP-1 protocols) and resistance training, the higher dose ranges may actually preserve lean mass better than lower doses, because the energy deficit is being met predominantly through fat oxidation rather than muscle catabolism

Symptoms may include numbness or tingling in the hands and feet (peripheral neuropathy), difficulty walking, balance problems, muscle weakness, memory loss, cognitive impairment, and mood disturbances

NAD injections should never replace evidence-based medical treatments or delay proper diagnostic investigation of symptoms like persistent fatigue