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Special populations, such as post-bariatric surgery patients and those on metformin, may require tailored dosing regimens to ensure adequate vitamin B12 levels

This condition can indirectly pave the way for weight gain by reducing your level of physical activity

NBC News

So, while the idea that B12 injections cause weight gain might be a popular rumor, current evidence indicates that a vitamin B12 deficiency is unlikely to affect your weight directly in terms of gain

Vegans or strict vegetarian diets can be at particular risk of developing a deficiency as non-animal sources of food usually contain no or very low doses of B12

The body relies on B12 to make red blood cells and keep the nervous system working, which is why some people need these injections more often