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But one of best sources by far is something that may not be a regular on your menu: beef liver

Always check for the Health Canada logo or Drug Identification Number (DIN) on any product

The result is a decrease in appetite and an increase in satiety, making it easier to reduce caloric intake and promote weight loss

And its sometimes not just one thing

As well as from poor diet and digestion, vitamin B12 deficiencies can also be affected by a genetic condition such as: o Pernicious anaemia o Crohns disease o Treatment with proton-pump inhibitors o Atrophic gastritis o Coeliac disease o Use of antacids (acid is required to release B12 from food) o Gastrointestinal surgery o Use of certain medications o Use of illegal drugs and substances including nitrous oxide