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A lack of vitamin B12 doesnt directly lead to weight gain, however, so getting a B12 injection alone wont cause you to lose weight no matter how many times your doctor calls the injection a skinny shot

They may also change how the immune system works, which could be a problem if you have an autoimmune condition

*JAMA Internal Medicine*, 173(5), 386-388

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Research suggests it may work through different mechanisms, potentially involving direct interaction with adipocyte membranes or intracellular signaling pathways distinct from classical GH receptor activation

What is a Vitamin B-12 Deficiency