NutriStack
Methylfolate and Valproic Acid, a synergy.
Valproic acid has been associated with disturbances in one-carbon metabolism and higher homocysteine in epilepsy studies. Methylfolate may help support folate-dependent methylation when folate status is low or homocysteine is elevated, but it does not make valproic acid safe in pregnancy and should not be presented as protection from valproate teratogenicity. This is most relevant for long-term therapy, pregnancy planning, restricted diets, anemia, neuropathy symptoms, or known folate-pathway variants.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Methylfolate and Valproic Acid
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Moderate evidence
Synergy
What is happening. Valproic acid has been associated with disturbances in one-carbon metabolism and higher homocysteine in epilepsy studies. Methylfolate may help support folate-dependent methylation when folate status is low or homocysteine is elevated, but it does not make valproic acid safe in pregnancy and should not be presented as protection from valproate teratogenicity. This is most relevant for long-term therapy, pregnancy planning, restricted diets, anemia, neuropathy symptoms, or known folate-pathway variants.
Mechanism. Valproic acid has been linked with altered folate-dependent one-carbon metabolism and elevated homocysteine. Methylfolate is 5-methyltetrahydrofolate, the methyl donor used with vitamin B12 for homocysteine remethylation to methionine.
Recommendation. Ask about folate, vitamin B12, and homocysteine testing if you take valproic acid long term or are planning pregnancy. Use methylfolate only as an adjunct and do not change valproic acid dosing without your prescriber. If pregnancy is possible, discuss valproate alternatives and folate strategy before conception because folate does not reliably prevent valproate-associated birth defects.
Sources (3)
- Ni G, Qin J, Fang Z, Chen Y, Chen Z, Zhou J, et al. Increased homocysteine levels in valproate-treated patients with epilepsy: a meta-analysis. BMJ Open. 2014;4(7):e004936. PMID 25031190
- Belcastro V, Striano P, Gorgone G, Costa C, Ciampa C, Caccamo D, et al. Effects of antiepileptic drug monotherapy on one-carbon metabolism and DNA methylation in patients with epilepsy. PLoS One. 2015;10(4):e0125656. PMID 25915064
- Turgut U, Kazan S, Cakin H, Ozak A. Valproic acid effect on neural tube defects is not prevented by concomitant folic acid supplementation: Early chick embryo model pilot study. Int J Dev Neurosci. 2019;78:45-48. PMID 31376429
Stack Score
How this pair moves the number.
Effect on the composite score
If both Methylfolate and Valproic Acid are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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