These include: Meat Fish Poultry Milk Eggs Fortified breakfast cereals Fortified breads Fortified nutritional yeasts Fortified plant milks If you follow a vegan diet (meaning you don't eat any animal products, including meat, milk, cheese, and eggs) or you're a vegetarian who doesn't eat enough eggs or dairy products, you could be lacking in vitamin B12
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Some people are more likely to develop B12 injection side effects, especially when other conditions are present
HSS journal : the musculoskeletal journal of Hospital for Special Surgery , 21 (4), 15563316251355551
Compounded tirzepatide, on the other hand, is not FDA-approved