For people with normal B12 levels, the effect is much less clear, and wed rather tell you that honestly than oversell it
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One crucial function it provides is the production of red blood cells, which carry oxygen throughout the body for various functions
When someone arrives with a significant deficiency, their stores are low, their red blood cells may be enlarged (macrocytosis), and, in longstanding cases, nerve function can be affected
Body weight and food intake were recorded every other day