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B12 injections are one of the most effective ways to restore and maintain healthy B12 levels particularly for those who struggle with absorption through food or supplements

FABAD Journal of Pharmaceutical Sciences 38(3): 151

This injection is usually given intramuscularly or intravenously

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Heavier individuals may require higher doses to achieve equivalent NNMT inhibition due to larger adipose tissue mass and potentially higher baseline NNMT activity

Vitamin B12 injections are usually for people with conditions that affect the body absorption of vitamin B12 and those who have undergone gastric surgery