The most common B12 subcutaneous injection sites are the following: The upper arm To self-administer a B12 injection into the arm, pinch a thick skin layer of the side or back of the upper arm and insert the needle at a right angle
If you take B12 supplements, multivitamins, or receive B12 injections, the high result is almost always a reflection of your intake and is clinically insignificant
International regulations vary in some countries, it may be classified as an unlicensed medicine or research chemical
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Some people experience digestive upset from high-dose B12 supplements
It may ease symptoms of depression, anxiety, and even support memory and focus