My favorite folate source is lentils. One cup of cooked lentils will provide 90 percent of the daily value of folate. There are other sources of folate, like black beans, but they will provide a lower percentage of the DV. I prefer to have the natural form of folate instead of the man-made folic acid that can cause problems.

There are times when I feel fatigued while doing all the "right stuff". like taking my daily dose of sublingual B12, and I realize that it has been awhile since I had lentils. After having lentils (folate/B9), I come out of the fatigue.

It is an on going process to allow the red blood cells to bring oxygen to all parts of our body. If there is insufficient B12/B9, I will go back to the "wipe out" feeling.

From National Library of Medicine:
"Patients who had myeloproliferative disorders had a high prevalence of vitamin B12 deficiency, despite high serum vitamin B12 levels. Therefore, vitamin B12 status should be evaluated in patients with myeloproliferative disorders."
https://pubmed.ncbi.nlm.nih.gov/25730455/#:~:text=Conclusions:%20Patients%20who%20had%20myeloproliferative,in%20patients%20with%20myeloproliferative%20disorders.