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How Fast Does a Vitamin B12 Shot Work

"Patients will suffer from the usual side-effects of extreme tiredness, irrational behaviour, mood swings, memory problems." The British National Formulary, which sets guidelines for the use of vitamin B12 in pernicious anaemia, said the practice was based on the best available evidence base

Medical Conditions Leading to Deficiency Several medical conditions interfere with B12 absorption, making b12 injections a necessary treatment

Medical conditions: Certain medical conditions, such as Crohns disease, celiac disease, and HIV infection, can interfere with the absorption or metabolism of vitamin B12

The vitamin does not possess thermogenic properties nor does it directly influence adipose tissue metabolism