How and where can i give myself a 2ml shot of vitamin b12?

Hard to say: Though a vitamin, the injectable form of b-12 usually requires a prescription. Unless one has a significant case of pernicious anemia, some type of bowel problem or bowel surgery and a few other instances, b-12 by injection can be sujpplanted by oral or sublingual b-12. You should know your b-12 level if you are concerned and be careful. You can mask other problems.

At your doc: Why do you want a shot of B12? Unless you are deficient, it will not do you any good. B12 in a pill could be sufficient unless you have problem with absorption of B12. Have a healthy diet, exercise, drink plenty of water, have safe sex, and get HPV vaccine. Wish you good health!