b12 vitamins

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i was told the other night that taking 2000mg of b12 can help lose weight, has anyone else heard this? im trying to find something different because i have been taking stacker xplc's and i think ive become immuned to them because ive been takin them for so long and have not lost weight, ive been gaining it back! ugh, i also tried quick trim and that doesnt seem to be working either, im getting a bit frustrated here and i exercise and eat the calories im suppose to....HELP!