Seeking Health L-Methylfolate
$29.80
Seeking Health Folate supplement: L-5-methyltetrahydrofolate (L-5-MTHF) as Quatrefolic®.
Already in the active form, no conversion by the MTHFR enzyme required.
Only 2 left in stock
Ships same business day from Melbourne (orders before 2pm)
What is Seeking Health L-Methylfolate and who is it for?
Seeking Health L-Methylfolate provides 1,700 mcg DFE of folate as L-5-methyltetrahydrofolate (L-5-MTHF) using the Quatrefolic® form. Unlike folic acid or food folates, this is the form that circulates in the body and crosses the blood-brain barrier, meaning it doesn’t depend on the MTHFR enzyme to become usable. It’s a single-ingredient capsule, suitable from age four and appropriate for pregnancy, breastfeeding, and vegetarian or vegan use.
This makes sense for people who’ve identified MTHFR gene variants affecting folate metabolism, those working with a practitioner on methylation or homocysteine pathways, or anyone who wants to ensure their folate intake is in a form cells can use directly. It’s also widely used during pregnancy for neural tube development, where adequate folate status is particularly important.
Fairfield Nutrition Thoughts
L-methylfolate comes up constantly in practice, particularly once people start looking into MTHFR variants. The core issue is straightforward: folic acid and dietary folates need to be converted into L-5-MTHF before cells can use them, and the MTHFR enzyme drives that conversion. When that enzyme is less active, folate status can be compromised even with adequate dietary intake. Providing the active form directly sidesteps that bottleneck.
The evidence here is well-established rather than emerging. L-5-MTHF is the predominant circulating form of folate in the body, it’s the only folate form that crosses the blood-brain barrier, and its role in methylation, homocysteine metabolism, and neural tube development is thoroughly documented. Seeking Health uses Quatrefolic®, a stabilised, high-bioavailability form of L-5-MTHF with solid research behind it. The 1,700 mcg DFE dose is meaningful without being excessive..
Why This Formulation / How It Works
Most folate supplements use folic acid, a synthetic form that requires several enzymatic conversion steps before it becomes usable. Food folates also require conversion. L-5-MTHF skips those steps entirely because it’s already in the form your cells use. For people with reduced MTHFR enzyme activity, this difference is significant. Seeking Health uses Quatrefolic®, a patented, highly stable form of L-5-MTHF that has been specifically studied for bioavailability. The single-ingredient capsule format also makes dose adjustment straightforward, which matters because individual responses to methylfolate can vary.
Role in Methylation Pathways
Methylation is a biochemical process in which methyl groups are transferred between molecules, driving reactions involved in DNA synthesis, gene expression, neurotransmitter production, and cellular processes. L-5-MTHF donates its methyl group to convert homocysteine into methionine, a reaction that sits at the centre of the methylation cycle. Methionine is then used to produce SAMe (S-adenosylmethionine), the body’s primary methyl donor. Without adequate L-5-MTHF, this cycle slows.
The Blood-Brain Barrier and Nervous System Access
L-5-MTHF is the only form of folate that can cross the blood-brain barrier via active transport. Folic acid and other folate forms do not share this access. Inside the central nervous system, folate is involved in the synthesis of neurotransmitters including serotonin, dopamine, and noradrenaline, via its role in methylation reactions. This is why folate status is relevant to cognitive and mood-related pathways, and why the form of folate matters, not just the amount.
When to Consider This
This formulation provides targeted methylation pathway support. It makes sense if you’re:
- Someone whose healthcare provider or genetic testing has identified MTHFR variants (C677T or A1298C) that may affect folate metabolism.
- Pregnant or planning pregnancy, where adequate folate status is particularly relevant to neural tube development in early gestation.
- Working with a practitioner on homocysteine levels and looking to address folate’s role in that pathway.
- Someone who has been using folic acid and wants to switch to the active form for better cellular availability.
Supplement strategy: Many people introduce L-methylfolate as part of a broader methylation support approach, often alongside B12 (particularly methylcobalamin) and sometimes B6. Those new to methylation support often start at lower doses and increase gradually, as individual responses vary. Working with a practitioner familiar with methylation is worthwhile, particularly if you have identified MTHFR variants.
⚠️ Not suitable for: Children under 4 years without professional guidance. Do not take within 5 hours of bedtime as it may interfere with sleep. Consult your healthcare professional before use if pregnant, breastfeeding, or taking medications including methotrexate or other folate-affecting drugs.
How to Use
Take 1 capsule as needed, with or without food. Each capsule provides 1,700 mcg DFE of folate as L-5-MTHF. Avoid taking within 5 hours of bedtime, as methylfolate can be activating for some people and may affect sleep onset.
Suitable for adults and children from age 4, as well as during pregnancy and breastfeeding. Use as directed by your healthcare professional, particularly if you are new to methylfolate or have identified MTHFR variants, as individual responses to methylation support can vary and some people do better starting at lower doses.
Ingredients
Per 1 capsule:
Folate (as L-5-methyltetrahydrofolate, Quatrefolic®) — 1,700 mcg DFE (1,000 mcg L-5-MTHF)
Other ingredients: Hydroxypropyl methylcellulose (capsule), microcrystalline cellulose, ascorbyl palmitate.
Allergen information: Free from common allergens. Suitable for vegetarian and vegan use.
Common Questions
How is this different from folic acid?
Folic acid is a synthetic form that your body needs to convert into L-5-MTHF before it can be used. L-methylfolate is already in the active form, so no conversion is required. For people with reduced MTHFR enzyme activity, this distinction matters because the conversion step is where the bottleneck occurs.
Why might this affect sleep if I take it too late in the day?
Methylfolate is involved in neurotransmitter production pathways, and for some people it can be activating. Taking it within a few hours of bedtime occasionally interferes with sleep onset. This varies between individuals, but the manufacturer recommends avoiding it within 5 hours of bedtime as a precaution.
I don’t know if I have an MTHFR variant. Is this still relevant for me?
Potentially, yes. Estimates suggest over half the population carries at least one MTHFR variant, many without knowing it. Even without confirmed genetic variants, L-5-MTHF is simply a more bioavailable form of folate than folic acid. That said, if you’re unsure whether this is appropriate for your situation, a conversation with your healthcare provider is worthwhile.
Can I take this alongside other B vitamins?
Yes. Methylfolate is commonly used alongside methylcobalamin (B12) and B6, as these nutrients work together in methylation and homocysteine metabolism pathways. If you’re already taking a B-complex, check whether it already contains L-5-MTHF to avoid doubling up unintentionally.
Warnings & Storage
Do not use if: Under 4 years of age without professional guidance. Do not take within 5 hours of bedtime.
Cautions: Consult your healthcare professional before use if pregnant, breastfeeding, or taking any medications, particularly methotrexate or other medications that affect folate metabolism. Individual responses to methylfolate vary; some people find starting at a lower dose more comfortable.
Storage: Store in a cool, dry place, out of reach of children.
Always consult your healthcare professional before use if you have any pre-existing conditions or are taking medications.
| Weight | 0.03 kg |
|---|---|
| Suggested Use | Take 1 capsule, as needed, just prior to consuming high histamine foods or drinks. Or, take away from food if wanting to support healthy histamine levels in the digestive tract. Use as directed by your healthcare professional. Do not take this supplement and knowingly eat foods you are allergic to – it will not prevent allergic reactions. |
| Warnings | Children and pregnant or lactating women should consult their healthcare practitioner prior to use. This product contains an ingredient derived from porcine (pig). Avoid if allergic to pork or any other ingredient. Histamine Block is NOT EFFECTIVE for symptoms of immune-related food allergies, such as peanuts, shellfish, etc., or for gluten intolerance due to sensitivity or celiac disease. DAO is not absorbed and does not have systemic activity. Histamine Block does not manage or address antibody-related or IgE-related food allergies. |
