what are the side effects of having b12 injections Vitamin Injections: Benefits for Your Health Feeling worse after B12 Injection:

Contact your pharmacy or healthcare provider to obtain a replacement prescription

This matters for people whose bodies struggle to absorb B12 through food, since an injection skips the digestive absorption step that oral supplements depend on

not necessarily related to need in any way

however, unlike nicotinic acid, niacinamide does not usually cause the intense flushing reaction (redness/itching) of the skin

After ingestion, stomach acid separates B12 from food proteins, and then intrinsic factor produced in the stomach lining binds to B12 so it can be absorbed in the ileum (the final section of the small intestine)