how long it takes for b12 injections to work Injections: Who Should Get Them and Do They Last? how long does vitamin b12

Then, your doctor will adjust how often you get them based on how youre doing and your B12 levels

These extremely rare side effects include: Reactive thrombocytosis during the first week of use in megaloblastic anaemia Hypersensitivity reactions including: rash, itching, exanthema, antibodies to HYDR0XOCOBALAMIN-transcobalamin II Anaphylaxis Hypokalaemia Headache, paraesthesia, tremor Irregular heartbeat (arrhythmias secondary to hypokalaemia) Nausea Vomiting Diarrhoea Fever, chills, hot flushes, dizziness, malaise, pain and / or swelling at the injection site Acne Abnormal colouration of the urine (chromaturia) What should you not do after a B12 shot

Aids in Fetal Brain and Cognitive Development B12 influences neurological growth

This 1000 mcg dose is the go-to for shots in the muscle or under the skin