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Require nutrient support during calorie restriction or elimination diets
When, in the past, monitoring of symptoms had been done poorly, there may be some people who do not need parenteral B12 supplementation
Tracking these subjective measures provides a fuller picture of protocol impact
People with Digestive Issues: Conditions like Crohns disease, celiac disease, or irritable bowel syndrome can interfere with B12 absorption, making injections a more effective method of getting the nutrient
Because oral supplements are absorbed less effectively, you need to take them far more frequently than you would need an injection
doi:10.1016/j.soard.2013.04.017
