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Large amounts of B-12 are found in such foods as fish and beef, with smaller amounts in dairy products like cheese, yogurt, and eggs

There is no robust body of randomized controlled trial data demonstrating that lipotropic injections cause clinically significant fat loss beyond what the accompanying calorie restriction, activity changes, and clinical monitoring would have produced anyway

doi:10.1016/j.bcp.2019.02.008 Dimet-Wiley A, Latham CM, Brightwell CR, et al

"The role of homocysteine-lowering B-vitamins in the primary prevention of cardiovascular disease"

Only fortified nutritional yeast products contain B12

Certain medications , including acid reducer medication which interferes with B12 absorption and oral contraceptives