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The classic symptoms of B12 deficiency are persistent fatigue, tingling or numbness in the hands and feet, problems with memory and concentration, mouth ulcers, a sore red tongue, and pale or yellow-tinged skin

Conversely, isoniazid and pyrazinamide (tuberculosis drugs) are structural analogs of niacin that can interfere with niacin metabolism, potentially precipitating pellagra in rare cases

Maybe you've noticed it on your blood work, or perhaps you've heard other guys in TRT forums talking about it

Injectable Vitamin B12 (Cobalamin) Vitamin B12 is involved in the formation of red blood cells and in maintaining the health of the nervous system