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You may be more likely to have low levels of vitamin B12 if you: Have certain conditions that make it difficult for your body to absorb vitamin B12, including some digestive problems Are a vegan or vegetarian and dont eat many animal-based foods Are over age 50 Have some types of anemia Low levels of vitamin B12 can cause fatigue, weakness, memory loss, and other problems with your nervous system

Aging cell 2018;17, e12780, doi: Wang, Y

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