Usually, many are able to consume enough vitamin B-12 within their diet to reach the minimum supplement levels that are necessary; however, the ideal candidate for vitamin B-12 injections for weight loss is not looking to use vitamin B-12 to reach minimum levels of the vitamin. Usually, you will be considered a good candidate if you have a vitamin deficiency, as these vitamin injections provide beneficial nutrients to individuals that are at a higher risk of developing more issues. Individuals who are at greater risk are vegans and vegetarians this is because the base of the B-12 vitamin comes from animal-based products, which are not consumed by vegans and vegetarians. This also rings true for babies who are born vegetarians and vegans. Finally, if you have an impairment in absorbing nutrients like vitamin B-12, you are considered to be at higher risk. This will include seniors, if you are dealing with certain illnesses, abuse alcohol, and have gastric bypass surgery. You also will be considered an ideal candidate if you have weight to lose of 10 lbs or more.