What kind of pill are you taking? Most people who use diet aids, gain back the weight as soon as they stop taking them.
Vitamin B12 does nothing to help you lose weight, though it may give you more energy to exercise, etc.
Not sure what d1555 is referring to as the tiredness, with B12. Vitamin B12 is water soluble, so if you get too much in your system, it goes out in urine. I take B12 shots weekly, because of pernicious anemia and can attest that it does nothing to help with weight loss.
the shot u r talking about is b12 n it ok for some but if u have to many your body ends up having to much b12 then u dont want to do anything n your always so tried because u have to much b12...be carefully