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What folate does
Folate (vitamin B9) is needed to make DNA and new cells. That's why it matters most where cells divide fastest: in a baby's developing brain and spine in the first weeks of pregnancy, and in the bone marrow making red blood cells.
The neural tube, which becomes the brain and spinal cord, closes within about four weeks of conception, often before a woman knows she's pregnant. Too little folate then can leave it open, causing spina bifida or anencephaly. That's why folic acid has to be started before pregnancy, not after a positive test.
Low folate also causes megaloblastic anaemia: fewer, larger, poorly working red blood cells, the same type of anaemia B12 deficiency causes.
Folic acid vs methylfolate — which to buy
Folate is the natural form in food (dals, green leafy vegetables, citrus). Folic acid is the synthetic form used in supplements and fortified foods. It's stable and very well absorbed, and the body converts it to active folate. Methylfolate (L-methylfolate or 5-MTHF) is the active form itself, sold as the premium option.
The selling point for methylfolate is the MTHFR gene variant. People with two copies of the common MTHFR C677T variant convert folate less efficiently and tend to have somewhat lower blood folate. [5] But they still respond to folic acid: red-blood-cell folate rises with folic acid in every MTHFR genotype. [5] The US CDC advises that people with MTHFR variants can process folic acid, and folic acid is the form proven to prevent neural tube defects. [6]
Don't skip folic acid because of an MTHFR worry
The trials that proved neural tube defect prevention used folic acid. Methylfolate is a reasonable alternative, but it has no trial evidence of preventing birth defects. You don't need an MTHFR test before taking folic acid.
Clinical evidence — what the trials show
| Study | What was tested | Design | Key finding | Grade |
|---|---|---|---|---|
| MRC Vitamin Study (1991) — Lancet doi:10.1016/0140-6736(91)90133-A |
Folic acid 4 mg/day around conception vs other vitamins vs neither | RCT, 33 centres, 1,817 high-risk women | Neural tube defects fell by 72% with folic acid (relative risk 0.28). The other vitamins without folic acid had no significant effect. | A |
| USPSTF (2023) — JAMA JAMA recommendation statement |
Folic acid for anyone who could become pregnant | Evidence review and guideline | Grade A recommendation: 0.4–0.8 mg (400–800 mcg) folic acid daily for everyone planning or able to become pregnant. | A |
| Bhide et al. (2013) — Birth Defects Res A doi:10.1002/bdra.23153 |
Birth prevalence of neural tube defects in India | Systematic review, 19 studies, 308,387 births | 4.1 neural tube defects per 1,000 births in India. | A |
| Anderson et al. (2013) — Mol Nutr Food Res doi:10.1002/mnfr.201200108 |
Folic acid response by MTHFR C677T genotype | Crossover trial | Folate levels rose with folic acid in all genotypes. Responses differed somewhat by genotype, but folic acid worked in all of them. | B |
Dose and timing
Evidence-based protocol
Could become pregnant: 400–800 mcg folic acid daily, starting at least one month before conception and continuing through the first 3 months of pregnancy. [2] Previous pregnancy affected by a neural tube defect, or other high-risk situations: a much higher prescription dose (the MRC trial used 4 mg). This needs a doctor's advice. [1] Pregnancy in India: the national programme provides daily iron + 500 mcg folic acid tablets through pregnancy. See our iron deep-dive. Everyone else: food and a standard multivitamin usually cover it.
Folate-rich Indian foods include dals and rajma, chickpeas, green leafy vegetables (palak, methi), and citrus fruit. Food folate is lost with long cooking, and food alone isn't enough to reliably prevent neural tube defects, which is why supplements are recommended before pregnancy.
India-specific context
High neural tube defect rates, no mandatory fortification
The key message for India is timing. The neural tube closes within about 4 weeks of conception, but antenatal care, and the free IFA tablets, usually begin later. [3][7] Anyone who could become pregnant benefits from daily folic acid before conception, not just after a positive test.
Brand comparison
| Product | Price | Folate form & dose | Score | Our take |
|---|---|---|---|---|
| Govt IFA tablet (Anaemia Mukt Bharat) | Free | Folic acid 500 mcg + iron 60 mg | — | Free in pregnancy through government health facilities. |
| Carbamide Forte Women's Multivitamin | ₹549 / 60ct | Methylfolate + methylcobalamin + iron | 7.9 (B) | A good women's multi with a COA. Methylfolate is fine; just check the folate amount per tablet. |
| Purayati Iron + Folic Acid + B12 | ₹549 / 60ct | Methylfolate + methylcobalamin + iron bisglycinate | 7.7 (B) | Sensible combination for iron-deficient women. |
| Himalayan Organics Methyl Folate 1 mg | ₹549 / 60ct | 5-MTHF 1 mg | 7.1 (B) | Higher than the everyday need. Not necessary unless advised. |
| Himalayan Organics Folic Acid 5 mg | ₹299 / 90ct | Folic acid 5 mg | 6.2 (C) | A high-risk prescription dose, far above the upper limit for general use. Only on medical advice. |
Scores and prices come from our product database (2026). Note: our product scores credit "active forms" like methylfolate. For neural tube defect prevention specifically, plain folic acid is the form with trial evidence.
Safety
High doses can hide B12 deficiency
Large doses of folic acid correct the anaemia of B12 deficiency but not its nerve damage, which can progress unnoticed. That's the basis of the 1,000 mcg upper limit for supplements. Indian vegetarians are often low in B12, so check B12 before long-term high-dose folic acid. [4]
Safe at standard doses
400–800 mcg a day is very well tolerated. Side effects are rare.
Some drugs interact
Methotrexate, some anti-epileptic drugs and some antibiotics interact with folate. If you take any of these, ask your doctor what folate dose to use.
5 mg is not an everyday dose
5 mg tablets are for specific high-risk situations under medical care, not general supplementation.
Scoring rubric — full breakdown
1. Evidence quality
A landmark randomised trial with a 72% reduction in a serious outcome, confirmed by later evidence and a grade A national recommendation. Evidence for uses beyond pregnancy is weaker. [1][2]
2. Dosage confidence
400–800 mcg daily is clearly defined, with a clear upper limit and a separate high-risk dose. [2][4]
3. India market fit
High neural tube defect rates, no mandatory flour fortification, and a free government supplement: the need is clear, and the main gap is starting before pregnancy. [3]
4. Safety profile
Very safe at recommended doses. We deduct for B12 masking at high doses, which matters in India's largely vegetarian population, and for high-dose products sold without guidance. [4]
5. Label accuracy (tested)
Doses are generally labelled clearly. We deduct for methylfolate marketing that implies folic acid doesn't work, and for high-dose products sold over the counter. [6]
References
- 1MRC Vitamin Study Research Group. Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. Lancet. 1991;338(8760):131–7.doi:10.1016/0140-6736(91)90133-A
- 2US Preventive Services Task Force. Folic acid supplementation to prevent neural tube defects: US Preventive Services Task Force reaffirmation recommendation statement. JAMA. 2023. jamanetwork.com
- 3Bhide P, et al. Systematic review of birth prevalence of neural tube defects in India. Birth Defects Res A Clin Mol Teratol. 2013.doi:10.1002/bdra.23153
- 4Miller JW, et al. Excess folic acid and vitamin B12 deficiency: clinical implications? Food Nutr Bull. 2024. PubMed 38987872
- 5Anderson CA, et al. Response of serum and red blood cell folate concentrations to folic acid supplementation depends on methylenetetrahydrofolate reductase C677T genotype: results from a crossover trial. Mol Nutr Food Res. 2013.doi:10.1002/mnfr.201200108
- 6US Centers for Disease Control and Prevention. MTHFR gene variant and folic acid facts. cdc.gov
- 7Ministry of Health and Family Welfare, Government of India. Anemia Mukt Bharat — Operational Guidelines. nhm.gov.in
Medical note. This page is educational and not a diagnosis. If you're planning a pregnancy, see a doctor for pre-conception advice, especially if you have epilepsy, diabetes, obesity or a previous pregnancy affected by a neural tube defect, which can change the recommended dose.
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