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Potential Side Effects and Safety Considerations Vitamin B12 injections are generally well-tolerated with an excellent safety profile when administered appropriately

Vitamin B12 is associated with a particular type of anemia known as megaloblastic anemia

Good sources of vitamin B12 include: Meat (beef, lamb, and pork) Poultry (chicken and turkey) Fish (salmon, trout, and sardines) Dairy products (milk, cheese, and yogurt) Eggs Fortified cereals and plant-based milk alternatives For individuals who do not consume animal products, it is important to seek out fortified foods or consider taking a B12 supplement to prevent deficiencies that could affect hair health

Use caution if you have diabetes, liver or kidney disease, cardiovascular disease, or a history of eating disorders