Visit nearest hospital

You can certainly do it by yourself at home. It is usually given IM that is you can give it in the upper outer part of your buttocks where you have the muscles or you can give it subcutaneously. SO if you have have some belly fat, you can inject the B12 into the fat folds just like insulin. 4 shots weekly would be more than enough to last you 2-3 years.

For full guidance, prescription and follow up take a paid instant consultation. Hope that helps. You can even video consult directly via what sapp on 9999x104x408

You should visit a nearby clinic or any paramedical trained staff. For further assistance kindly take a consultation.