But most people underestimate the one variable that determines whether that investment actually pays off: nutrition
What are B12 injections used for
Dr Thornber advised: Vitamin B12 should be used with caution if you have any of the following conditions - heart concerns, high blood pressure, history of cancer, skin disorders, genitourinary concerns, gastrointestinal concerns, blood disorders, low serum levels of potassium, and history of gout. He added: If youre eating a balanced and healthy diet you should get enough B12 from your food including, meat, fish, dairy products, and eggs
This includes consideration of a number of factors including the products effect on the body, the way it is used and takes into account all the available evidence and relevant legal precedents
doi: 10.1016/j.mayocpiqo.2019.03.002
Just for comparisons sake, lets look at perhaps the most well known PED: erythropoietin, better known as EPO