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Also known as cobalamin, vitamin B12 is essential for the formation of red blood cells and DNA

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When you swallow a B12 pill, several steps have to work for it to be absorbed: stomach acid and the enzyme pepsin must release B12 from food or the supplement, the stomach must secrete a protein called intrinsic factor that binds to B12, and the B12-intrinsic factor complex must reach the ileum (the end of the small intestine) where it is finally absorbed

Svensson K et al

B12 deficiency disrupts several of these pillars at once

Therefore, if you are gaining weight due to inefficient metabolism and vitamin deficiency, getting B12 vitamin shots can help you address this problem