While vitamin B12 naturally occurs in the body, making allergic reactions to it exceedingly rare, certain additives or preservatives in some preparations could cause mild localized reactions, such as redness or itching
Monitor your overall health so that treatment stays appropriate and B12 is not masking another issue such as folate deficiency
Absorption of nonheme iron, which is the form of iron found in supplements, is affected by a number of enhancers (e.g., vitamin C), as well as inhibitors (e.g., polyphenols found in tea and coffee)
Metabolic Physiology Research Experimental research has suggested that NNMT influences how cells regulate nutrient utilization, energy expenditure, and metabolic signaling
If you have a mild deficiency, it may take two or three shots over several days or weeks before you begin feeling the difference Pain, swelling or itchy skin where you had the injection