what is the side effect of b12 injection Common & Rare Effects Vitamin Injections Feeling worse after B12 Injection:

Cardiovascular Health Vitamin B12 helps reduce levels of homocysteine, an amino acid that, at high levels, is associated with an increased risk of cardiovascular diseases

The absorption of B12 is a complicated process but the two main components that are needed are the Hydrochloric acid in your stomach, which releases the B12 from food, and a protein called Intrinsic Factor which is produced in the lining of your stomach and which enables the absorption of B12 in the Ileum

Drug interaction report: Chloramphenicol and Vitamin B12

Research on its long-term safety remains insufficient

The Different Forms of Vitamin B12 Supplements Vitamin B12 plays a vital role in energy, brain function, metabolism, and nervous system health

Intravenous vitamin C can produce very high levels of vitamin C in the body