Folate is arguably the most critical nutrient for fertility and early pregnancy—it prevents neural tube defects and supports healthy fetal development. But here's what many women don't know: up to 40% of people have genetic variations that make it difficult to process synthetic folic acid.
That's where methylfolate comes in. In this guide, we'll explain the difference between folate forms, who needs methylfolate, and which supplements are best.
Folic Acid vs. Methylfolate: What's the Difference?
Folic acid is the synthetic form found in most supplements and fortified foods. Your body must convert it through multiple steps to become usable (methyltetrahydrofolate).
Methylfolate (also called L-methylfolate, 5-MTHF, or "active folate") is the already-converted form your body can use directly. No conversion needed.
| Factor | Folic Acid | Methylfolate |
|---|---|---|
| Requires conversion | Yes | No |
| Works for MTHFR variants | Limited | Yes |
| Immediately bioavailable | No | Yes |
| Risk of accumulation | Possible | Minimal |
| Cost | Lower | Higher |
The MTHFR Factor
MTHFR gene variations affect the enzyme that converts folic acid to its active form. About 40% of people have at least one variant, and roughly 10-15% have variants on both copies (homozygous), significantly reducing conversion ability.
If you have MTHFR variants, taking folic acid may not provide adequate folate protection, even if blood tests show "normal" folate levels. Methylfolate bypasses this issue entirely.
Testing isn't strictly necessary since methylfolate works for everyone—with or without MTHFR variants. Many practitioners now recommend methylfolate as the default for all preconception and pregnancy supplementation. However, if you have a family history of neural tube defects, recurrent miscarriage, or want to know your status, genetic testing is available.
Best Methylfolate Supplements
Thorne 5-MTHF 1mg
Thorne is the gold standard for methylfolate. They use Quatrefolic, the glucosamine salt of methylfolate that provides superior stability and absorption. NSF certified for sport, meaning it's tested to the highest purity standards. The 1mg dose is ideal for preconception and pregnancy.
✓ Pros
- Quatrefolic form (best stability)
- NSF certified purity
- Practitioner-trusted brand
- Ideal 1mg pregnancy dose
— Cons
- Premium pricing
- May need additional B12
Jarrow Formulas Methyl Folate 400mcg
If your prenatal already contains some folate and you just want a methylfolate top-up, Jarrow's 400mcg dose is perfect. Uses the same high-quality Quatrefolic form as premium brands at a lower price point. Good option if higher doses cause side effects.
✓ Pros
- Quatrefolic form
- Affordable price
- Gentle dose
- Good for sensitive individuals
— Cons
- May need 2 for higher doses
- Basic packaging
Pure Encapsulations 5-MTHF 1mg
Pure Encapsulations is the go-to for people with sensitivities. Their hypoallergenic formula contains no common allergens, fillers, or additives. Uses Metafolin, another high-quality patented methylfolate. Frequently recommended by integrative practitioners.
✓ Pros
- Hypoallergenic formula
- No fillers or additives
- Metafolin form
- Practitioner favorite
— Cons
- Premium price
- May need additional B12
How Much Methylfolate Do You Need?
- Minimum for pregnancy: 400mcg DFE (dietary folate equivalents)
- Recommended for TTC/pregnancy: 800-1000mcg
- With MTHFR variants: 800-1200mcg (as methylfolate)
- History of neural tube defects: Up to 4mg (consult your doctor)