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B12 enhances the production of serotonin, the feel-good hormone that regulates your mood

Some patients may experience an improvement and partial recovery of visual function after vitamin B12 supplementation. Other symptoms warning of low B12 levels include: A pale-yellow tinge to your skin A sore and red tongue (glossitis) Mouth ulcers Pins and needles (paraesthesia) Changes in the way that you walk and move around Disturbed vision Irritability Depression.

However, with proper treatment addressing the multiple causes, most people can achieve excellent control with minimal symptoms

Physiological roles of urocortins, human homologues of fish urotensin I, and their receptors