Vitamin B12 is given as injection (usually the top of the arm) for the treatment of those with a vitamin b12 deficiency.
You may be at risk of vitamin B12 deficiency if you experience any of the following:
Bear in mind that many of these signs and symptoms can also be demonstrative of other conditions and so it important to consult the doctor prior to having an injection.
You may feel a slight sting as the injection is inserted, but it is very quick and takes less than two seconds.
If you are b12 deficient, you can expect to feel an improvement in your signs and symptoms within a matter of days.
Anywhere from 1-3 months.
vitamin b12 injections are very safe, it is not possible to take too much vitamin b12, and these side-effects are so rare that they are unable to gather actual statistics other than the risk is less than 1 in 10'000.
The Independent General Practice