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The following groups of people are at a greater risk of developing a vitamin B12 deficiency: Vegans or vegetarians People 75+ years Having a digestive system disorder like Crohns or celiac disease Drinking excessive amounts of alcohol Having Sjgrens syndrome Taking certain medications like oral birth control or metformin Common symptoms of a vitamin deficiency include fatigue, numbness, poor balance, memory loss, and breathlessness

Mild redness, tenderness, or temporary swelling at the injection site may occur

Research suggests such a prescription exists and it goes by the name of Selank

Electrophysiological analysis Electrophysiological analysis was performed at 4 weeks post-crush injury of sciatic nerves of rats [40]