BACK IN THE ’70S PEOPLE USED TO GET THESE FOR HANGOVERS AND JET LAG: Vitamin B-12 Shots Are Being Hyped As A Good Way To Lose Weight. I think I’ll pass, but maybe I’ll have a cheeseburger just to be safe: “According to the NIH, the daily recommended allowance for vitamin B-12 is 2.4 micrograms for both men and women (it goes up to 2.6 micrograms for pregnant women, and 2.8 micrograms for those who are nursing). JSYK: A double cheeseburger has 2.1 micrograms of vitamin B-12, per the NIH.”

The article does not mention that people on proton pump inhibitors (like Prilosec or Nexium) may have trouble absorbing B12.