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When you swallow a B12 pill, several steps have to work for it to be absorbed: stomach acid and the enzyme pepsin must release B12 from food or the supplement, the stomach must secrete a protein called intrinsic factor that binds to B12, and the B12-intrinsic factor complex must reach the ileum (the end of the small intestine) where it is finally absorbed

A trained professional knows the correct technique, including using the right needle to ensure the injection is as comfortable and effective as possible

Nicotinamide N-methyltransferase: more than a vitamin B3 clearance enzyme

This allows for a more targeted and practical approach

Avoid containers marked 3 (for polyvinyl chloride, or PVC), 6 (for polystyrene, or PS), and 7 (for polycarbonate)