what happens if vitamin b12 injections don& 39 Doctor explains Deficiency | Causes, Symptoms, Foods, Treatment and more! Vitamin B12 deficiency - Wikipedia

While contact dermatitis is generally not life-threatening, a vitamin B12 allergy can occasionally lead to severe reactions

The patient complained of severe, sharp, stabbing pains on the right side of his face involving the mandibular, maxillary and ophthalmic branches of the trigeminal nerve

Research shows that 4 mm needles are effective, less painful, and carry no risk of penetrating muscle tissue, even in lean people

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Chronic insufficiencycan affect the spinal cord, peripheral nerves, optic nerve, and brain