Anemia is main: There are many symptoms of B12 deficiency. The most prominent is a type of anemia where your red blood cells are decreased in number, increased in size, and decreased in color. Since they are not normal, they do not carry oxygen like they're supposed to. As B12 deficiency worsens, the anemia gets worse and you get weaker and sicker. You also have trouble with thinking and brain function, etc..
Answered 2/24/2019
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