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Updated March 7, 2025
Original article: January 6, 2008
I do a lot of psychopharmacology research — more than most people would consider normal. I try to share only the most interesting and relevant findings while sparing you the more technical details. But today, you're in for a deeper dive.
This topic is too important to ignore, especially if you’re struggling with treatment-resistant depression.
L-methylfolate (MTHF) is the biologically active form of folate, a B vitamin crucial for brain function and neurotransmitter production. Your body converts dietary folate into MTHF, but this process requires specific enzymes — and not everyone produces enough of them efficiently.
You’ve probably heard of folic acid, the synthetic version of folate commonly found in supplements and prenatal vitamins. While folic acid can increase MTHF levels, the conversion process isn’t always effective, particularly for people with certain genetic variations.
Low levels of MTHF are linked to depression, and some people don’t synthesize enough of it, even with a folate-rich diet or supplements. This is where things get interesting:
Emerging research indicates that L-methylfolate supplementation may improve antidepressant response (see below) in people with depression. Unlike standard antidepressants, which directly influence neurotransmitters, MTHF works by supporting their natural production. (Note: The research below suggests that it might work even better for those with inflammation or a higher body mass index [BMI], obesity.) L-methylfolate has even been shown to help those with treatment-resistant depression.
The Food and Drug Administration (FDA) regulates L-methylfolate as a medical food, meaning it requires a prescription but is not classified as a drug. This means it's unlikely to contribute to your side effect load.
My doctor — who is about as no-nonsense as they come — introduced me to L-methylfolate. She respects the researchers studying it and felt it was worth trying. After being on anticonvulsants for years (eight, to be exact), it’s not shocking that I might be low on key nutrients.
Could this explain why antidepressants sometimes stop working? Could MTHF be the missing piece for some people? Possibly.
L-methylfolate isn't a miracle cure, and the research is still evolving. But if antidepressants aren’t working — or if they’ve stopped working — it might be worth discussing with your doctor. Since it’s relatively low-risk compared to other psychiatric treatments, it could be an option worth exploring.
As always, don’t start any new supplement without medical supervision, especially if you’re on other medications.
Here are some recent studies that show that L-methylfolate may benefit those taking an antidepressant for depression:
Natasha Tracy is an award-winning writer, speaker, advocate, and consultant from the Pacific Northwest. She has been living with bipolar disorder for 26 years and has written more than 2000 articles on the subject.
Find more of Natasha’s work in her acclaimed book: "Lost Marbles: Insights into My Life with Depression & Bipolar" on Amazon.
Connect with Natasha at the social media links below.
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