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
Clean the injection site with an alcohol prep pad, pinch a fold of skin, insert the needle at a 45-90 degree angle (depending on body fat levels), inject slowly over 3-5 seconds, and dispose of used syringes immediately in a sharps container
Regardless of your age, you need to consume enough calories in order to engage in athletic activity, as well as to perform the activities of daily living
Stefan N et al
In more rare yet severe cases, you may experience: Itching or a feeling of swelling all over the body Muscle cramps and weakness Upset stomach and urinary problems Swelling in the ankles or feet Unusual tiredness Irregular heartbeat or trouble breathing If these side effects occur, consult your healthcare provider before continuing B12/MIC