Short Answer: If the cause is nutritional, FIGlu cannot rule out folate deficiency as a cause because it reflects tetrahydrofolate rather than methylene-THF. So, increasing the dose of folate or switching from methylfolate to folinic acid could be tried. Otherwise the most likely nutritional solution would be copper.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.