where is the best place to inject vitamin b12 Best Vitamin B12 Injection Sites:

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Oral & sensory clues Look out for a sore, red tongue, mouth ulcers, tinnitus (ringing in the ears), or disturbed vision

It is important to note that oral doses may be degraded by the digestive system, compromising their effectiveness

Other side effects that can occur include: Excessive sweat production Rapid weight gain Pain when breathing Shortness of breath when lying down Anxiety Increased or irregular heart rate Numbness, tingling or muscular weakness Increased thirst Urinary frequency B12 injections can also cause allergy symptoms immediately after administration, like difficulty breathing, a swollen throat, mouth, or swelling of the mouth, tongue or face