reaction to b12 injection uk Vitamin shot Experiences with vitamin B12 deficiency
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doi: 10.1111/j.1460-9568.1993.tb00221.x
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Laboratory studies using 5-amino-1MQ in aged animal models have revealed that NNMT inhibition modulates many age-associated metabolic parameters, including alterations in muscle tissue metabolism and cellular stress response pathways

They may look for signs of nervous system problems

In short, the only way to tell is to test your ferritin levels and do a full iron panel
