# Methylfolate (5-MTHF / Quatrefolic)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/methylfolate-5-mthf-quatrefolic
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-18
**Evidence Score:** 8 / 10
**Category:** Vitamin
**Also Known As:** (6S)-5-methyltetrahydrofolate, 5-MTHF, L-methylfolate, Levomefolic acid, Metafolin, Active folate, Bioactive folic acid, Methyltetrahydrofolate

## Overview

Methylfolate (5-MTHF) is the bioactive form of folate that bypasses the MTHFR enzyme conversion step required by folic acid. It directly supports DNA methylation, [neurotransmitter](/ingredients/condition/cognitive) synthesis, and homocysteine [metabolism](/ingredients/condition/weight-management) at the cellular level.

## Health Benefits

- Supports DNA synthesis and repair, ensuring healthy cell division and reducing cancer risk. - Essential for prenatal health, reducing neural tube defects by up to 70% when taken before and during early pregnancy. - Enhances mood and [cognitive function](/ingredients/condition/cognitive) by supporting neurotransmitter synthesis. - Supports [cardiovascular health](/ingredients/condition/heart-health) by regulating homocysteine levels, reducing heart disease risk. - Boosts immune function by promoting the production of [white blood cell](/ingredients/condition/immune-support)s. - Supports red blood cell formation, preventing anemia and reducing fatigue. - Promotes [skin health](/ingredients/condition/skin-health) by aiding in the repair and regeneration of skin cells.

## Mechanism of Action

Methylfolate acts as a methyl donor in the one-carbon [metabolism](/ingredients/condition/weight-management) cycle, transferring methyl groups to homocysteine via methionine synthase to produce methionine and S-adenosylmethionine (SAMe). This process supports DNA methylation, [neurotransmitter](/ingredients/condition/cognitive) synthesis including [serotonin](/ingredients/condition/mood) and dopamine, and maintains optimal homocysteine levels. Unlike folic acid, 5-MTHF bypasses the methylenetetrahydrofolate reductase (MTHFR) enzyme, making it effective even in individuals with MTHFR genetic polymorphisms.

## Clinical Summary

Clinical trials demonstrate methylfolate's efficacy in reducing neural tube defects by 70% when taken periconceptionally at 400-800 mcg daily. Depression studies show 15mg daily of L-methylfolate as adjunct therapy improved response rates by 18-30% in SSRI-resistant patients across multiple RCTs with 75-242 participants. [Cardiovascular](/ingredients/condition/heart-health) studies indicate 5-15mg daily reduces homocysteine levels by 13-25% in 4-12 week trials, though long-term cardiovascular outcome data remains limited.

## Nutritional Profile

- Active form of folic acid. - Water-soluble vitamin. - Involved in methylation processes.

## Dosage & Preparation

Typical dosage ranges from 400 to 1,000 mcg per day. Consult a healthcare provider before use.

## Safety & Drug Interactions

Methylfolate is generally well-tolerated with minimal side effects at therapeutic doses up to 15mg daily. High doses may cause sleep disturbances, vivid dreams, or irritability in sensitive individuals. It can mask vitamin B12 deficiency symptoms, making B12 testing important before supplementation. Methylfolate may enhance the effects of antifolate medications like methotrexate and should be used cautiously with anticonvulsants that affect folate [metabolism](/ingredients/condition/weight-management).

## Scientific Research

Numerous RCTs and meta-analyses confirm methylfolate's role in prenatal health and homocysteine reduction. Emerging studies suggest benefits in mood and [cognitive](/ingredients/condition/cognitive) support.

## Historical & Cultural Context

Folic acid was discovered in the 1940s, with methylfolate later identified as its active form, crucial for preventing birth defects and supporting heart health.

## Synergistic Combinations

Vitamin B12, Vitamin B6, DHA

## Frequently Asked Questions

### What's the difference between methylfolate and folic acid?

Methylfolate (5-MTHF) is the active form of folate that doesn't require MTHFR enzyme conversion, while folic acid is synthetic and must be converted through multiple steps. This makes methylfolate more bioavailable, especially for the 40% of people with MTHFR genetic variants who have reduced conversion capacity.

### How much methylfolate should I take daily?

Typical doses range from 400-800 mcg for general health and pregnancy support, up to 15mg daily for depression or elevated homocysteine under medical supervision. The tolerable upper limit is 1000 mcg from supplements for adults, though therapeutic doses often exceed this safely.

### Can methylfolate help with depression?

Clinical studies show 15mg daily L-methylfolate as adjunct therapy improves antidepressant response rates by 18-30% in treatment-resistant depression. It works by supporting neurotransmitter synthesis and may be particularly beneficial for individuals with MTHFR mutations or low folate levels.

### Is methylfolate safe during pregnancy?

Methylfolate is considered safe and highly beneficial during pregnancy, reducing neural tube defects by up to 70% when taken before conception and during early pregnancy. The recommended dose is 400-800 mcg daily, though some practitioners recommend higher doses for women with MTHFR variants.

### What are the side effects of methylfolate?

Most people tolerate methylfolate well, but high doses may cause sleep disturbances, vivid dreams, anxiety, or irritability in sensitive individuals. Starting with lower doses and gradually increasing can minimize these effects, and taking it earlier in the day may reduce sleep issues.

### Can I take methylfolate if I have the MTHFR gene mutation?

Yes, methylfolate is specifically beneficial for people with MTHFR gene mutations because it bypasses the enzymatic step that many with this mutation struggle with, providing a form of folate their body can utilize directly. Individuals with MTHFR mutations often have difficulty converting standard folic acid to its active form, making methylfolate (5-MTHF) a more effective supplementation choice. However, some people with MTHFR mutations report sensitivities to methylfolate at high doses, so starting with a lower dose and gradually increasing is recommended.

### Does methylfolate interact with medications like methotrexate or birth control pills?

Methotrexate works by blocking folate metabolism, so methylfolate supplementation may reduce its therapeutic effectiveness and should only be taken under medical supervision with cancer or autoimmune disease treatments. Birth control pills can deplete folate levels, making methylfolate supplementation potentially beneficial for women on hormonal contraceptives, though no direct interaction exists that prevents concurrent use. Always consult your healthcare provider before combining methylfolate with prescription medications to ensure optimal treatment outcomes.

### What's the difference between Quatrefolic and other methylfolate forms?

Quatrefolic is a stabilized, glucosamine salt form of methylfolate (5-MTHF) that offers superior stability and shelf-life compared to other methylfolate variants, making it less likely to degrade during storage. It has been shown in some studies to have slightly better absorption and bioavailability than older methylfolate forms, particularly in supplements with higher potency requirements. Both Quatrefolic and other high-quality methylfolate forms are effective, but Quatrefolic's stability makes it the preferred choice for manufacturers seeking consistent potency in finished products.

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