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Description
Vitamin B12 is crucial for many systems of the body to function correctly

doi: 10.1089/ars.2006.1465

It works by blocking the NNMT enzyme in fat cells and other tissues, which prevents the conversion of nicotinamide to 1-methylnicotinamide

Lacking in the vitamin could bring a host of symptoms warning of a deficiency and experiencing this sign on the corners of your mouth could mean you're deficient
