Looked up folic acid in my copy of the
Merck Manual of Medical Information. Principal sources of folic acid are leafy green veggies, fruits, liver and other organ meats, and dried yeast. It's main function is the maturation of red blood cells, and deficiency decreases the number of
all blood cells - RBCs and WBCs. Daily requirement is 200 ug.
So your doctor probably told you to intake more folic acid to boost RBC production, which in turn would increase the amount of oxygen you can take in.
Just thought I'd grab an official source.
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