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) B12 injections work quickly
The severity and duration of deficiency are primary determinantspatients with mild, recently developed deficiency typically respond more rapidly than those with longstanding, severe depletion
This means HCG doesnt offer a big advantage over a placebo for weight loss [3]
For people with healthy digestive systems, high-dose oral B12 supplements can be effective for a mild deficiency