This prevents overlapping doses and reduces the likelihood of dose-dependent adverse effects, particularly gastrointestinal symptoms which are the most common reason for treatment discontinuation
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However, it is extremely hard to tell whether your B12 levels are low, to begin with
The Vegetarian Resource Group suggests that vegans need to have reliable sources of vitamin B12 in their diets.1 The Vegetarian Nutrition Dietetic Practice Group (VNDPG) of the Academy of Nutrition and Dietetics (the Academy) says that all vegetarians (including vegans) should include a reliable B12 source in their diets, such as fortified foods or supplements.2 And The Vegan Society goes so far as to state, What every vegan should know about B12: the only reliable sources of B12 are foods fortified with B12 and supplements.3 Its extremely important for health care professionalsas well as clientsto understand the significance and intricacies of sufficient vitamin B12 intake for vegan diets, because deficiency of this essential micronutrient is serious business
And the short answer is we're still thinking about the best way