Thank you so much for that information. i just had the bypass three months ago and even though i have lost over 85 pounds i am feeling listless and tired with no energy. i were to have had two b-12 shots by now however i have had to miss two doctor appointments and with that i did not recieve my medication. this is my first time online in over three months and i get the most helpful information that i immediatly need from reading the first post. again thanks