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We reach for active-form folate over standard folic acid for most patients, because efficacy should not depend on a conversion step that a significant minority of people cannot perform efficiently. Thorne's use of L-5-MTHF, a brand known for rigorous quality standards and clinically relevant formulations, is precisely why this SKU earned its place on our shelves rather than a cheaper folic acid alternative.
About this product
Folate - L-5-MTHF
Thorne's Folate supplies L-5-methyltetrahydrofolate (L-5-MTHF), the biologically active form of folate that the body uses directly, without the conversion step required by folic acid. A meaningful proportion of the population carries variants in the MTHFR gene that reduce their ability to convert synthetic folic acid into this usable form. For those individuals — and for anyone wanting reliable folate status — L-5-MTHF is the more dependable choice.
Folate is a B-vitamin with well-established roles in DNA synthesis, cell division, and the methylation cycle. Adequate methylation underpins everything from neurotransmitter production to homocysteine regulation. Elevated homocysteine is a recognised cardiovascular risk marker, and folate is one of the key nutrients studied for keeping it in range. Folate is also critical in early pregnancy: sufficient intake before and during the first trimester is strongly associated with reduced risk of neural tube defects, making this a first-line supplement for anyone planning a pregnancy or in the early weeks.
This suits people with confirmed MTHFR variants, those with elevated homocysteine on a blood panel, women of childbearing age, and anyone whose diet is low in leafy greens and legumes. Thorne is a brand our doctors use routinely in clinical practice, chosen for its manufacturing standards and consistent use of bioavailable ingredient forms rather than cheaper synthetic alternatives.
What it does
Benefits
- 01
Active folate for those with MTHFR gene variants
- 02
Supports healthy homocysteine levels in the blood
- 03
Critical nutrient for early pregnancy and neural tube development
- 04
Contributes to DNA synthesis and normal cell division
- 05
Bioavailable form — no conversion step required
Get the most from it
How to use
Take 1 capsule daily, as directed on the packaging. Folate is water-soluble and can generally be taken with or without food. If you are pregnant or planning a pregnancy, confirm the appropriate dose with your GP or midwife.
What's inside
Ingredients
View full ingredient list
L-5-Methyltetrahydrofolate
Common questions
Frequently asked
What is the difference between L-5-MTHF and folic acid?
Folic acid is a synthetic form of folate that the body must convert into L-5-MTHF before it can be used. People with common MTHFR gene variants convert it less efficiently. L-5-MTHF bypasses that step entirely, providing the active form the body can use directly.
Do I need a genetic test before taking this?
No. While knowing your MTHFR status can be informative, L-5-MTHF is safe for the general population and is simply a more bioavailable choice regardless of genetics. If you have concerns about your methylation or homocysteine levels, a blood panel is a sensible starting point.
Is this suitable to take during pregnancy?
Folate is a recommended supplement before conception and throughout the first trimester. However, confirm the correct dose for your situation with your GP or midwife, as requirements can vary.
Can I take this alongside a B-complex or prenatal multivitamin?
It is worth checking the folate content of any other supplement you are already taking to avoid unintentionally high combined intake. Review with your doctor or pharmacist if you are unsure.
How long does it take to see a difference in folate or homocysteine levels?
Blood folate levels typically respond within a few weeks of consistent supplementation, while changes in homocysteine may take longer to become apparent on a panel. Retesting after 8–12 weeks is a reasonable way to assess your response.
Doctor-guided care
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