It’s not so much that folate is recommended because someone has a diagnosis of RA, it’s because it’s a requirement for patients on Methotrexate to mitigate side effects. MTX depletes folate which can lead to fatigue, nausea, vomiting, and mouth sores, so taking it alongside MTX helps patients better tolerate the drug.

My RA doctor put me on Folic Acid and it did nothing for the exhaustion. She suggested MethylPro, L-Methylfolate, 15 mg, 90 Capsules, one daily it really worked. I would come home from work and I litterly could not get moving. I would collaps in the recliner and I think if my house was on fire I couldn't have gotten up. I get them at my RA office, but you can get them on Amazon. Please ask your doctor first. Hope this helps.

Hi:
Folate, a B vitamin plays an important role in the management of RA, particularly when on Methotrexate therapy. Methotrexate and Folate deficiency are common, as it interferes with the Folate metabolism which potentially leads to deficiency. In my experience, I did NOT learn this from my RA dr years ago, but my GP.
Side effects from Folate deficiency are nausea, vomiting, mouth sores, liver inflammation, and changes in my blood cells. Suffered horribly with all above and no longer tolerate suffering and stopped after 5 weeks without approval. Took me a while to recover. Hope this helps you.