has anyone ever bought B12 shots from Mexico - I'm going in a few months and was thinking about getting some

I definitely would not go to Mexico and take any shots. Regulation of drugs is much less there. You could pick a disease such as AIDS or Hepatitis. I recommend the B12 you can buy in a drugstore. B12 deficiency is really not that common. B12 deficiency mainly occurs in vegetarians.

B12 shots are given here why do you want to get them from mexico my friends take them all the time to control her weight.

I worked with a mother and daughter both nurses that would go to each pharmacy in Tijuana and buy all the vials of b 12 they could get. then give them selves inj at home. I have been gettng Canada b12 for years...but they are now out. .... I have not the courage to go to Tijuana..... its so sad and I can not speak the language.

Hahaha at Wad's answer. Yeah, Wad. I too would regret buying 3 pairs of those.