As well, some people may have allergies or medical conditions that do not allow them to be a good candidate to receive vitamin B12 shots, such as kidney problems, low potassium levels, deficiencies in other vitamins such as iron or folic acid, or just an allergy or sensitivity to vitamin B12 itself
In these cases, oral supplements may be as effective as injections for many people
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(2001) Increase of Fat Oxidation and Weight Loss in Obese Mice by Chronic Treatment with hGH or a Modified C-Terminal Fragment Int J Obes 25(10):14429
Virtually no risk
Why Cost Shouldn't Keep You From Getting Care Vitamin B12 injections reliably help one group of people: those who are actually deficient in B12