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Talk with your doctor or a registered dietitian about whether or not you should supplement with B12 and how much you should take.

With the help of B12 injections, which bypass the intestines, the body can start benefiting from the needed vitamins within minutes

Unfortunately, diagnosing and treating B12 deficiency and its underlying cause(s) is more complicated than just ordering a blood test and taking a B12 supplement

For those interested in B12 for mood and focus, studies suggest a connection between vitamin B12 and neurotransmitters involved in emotional balance and concentration

One author recommends oral vitamin B12 500 to 1,000 g monthly.9 This is the advice I follow in my practice

This can vary quite a bit depending on where the clinic is located and if youre buying a one-off shot or a full course of injections