NutriStack
Valproic Acid and Vitamin B9, a synergy.
Vitamin B9, usually as folic acid, has human evidence as an adjunct to sodium valproate in acute mania and is also clinically relevant because valproate is a high-risk teratogen. Folic acid does not make valproic acid safe in pregnancy, but adequate folate status remains important for people who could become pregnant and for one-carbon metabolism. The benefit for mood symptoms is promising but not enough to replace mood stabilizer treatment.
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
- Valproic Acid and Vitamin B9
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 2 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. Vitamin B9, usually as folic acid, has human evidence as an adjunct to sodium valproate in acute mania and is also clinically relevant because valproate is a high-risk teratogen. Folic acid does not make valproic acid safe in pregnancy, but adequate folate status remains important for people who could become pregnant and for one-carbon metabolism. The benefit for mood symptoms is promising but not enough to replace mood stabilizer treatment.
Mechanism. Folate participates in one-carbon metabolism, methylation, and homocysteine remethylation, pathways relevant to neuropsychiatric function. Valproate is associated with teratogenicity and may interact with folate-dependent developmental pathways, while adjunctive folic acid may support mood treatment in selected bipolar patients.
Recommendation. Do not stop or lower valproic acid because you start Vitamin B9. If pregnancy is possible, discuss contraception, pregnancy planning, and folic acid dosing with your prescriber before continuing valproic acid. Use Vitamin B9 as a monitored adjunct, not as protection against valproate's full fetal-risk profile.
Sources (2)
- Behzadi AH, Omrani Z, Chalian M, Asadi S, Ghadiri M. Folic acid efficacy as an alternative drug added to sodium valproate in the treatment of acute phase of mania in bipolar disorder: a double-blind randomized controlled trial. Acta Psychiatr Scand. 2009;120(6):441-445. PMID 19392814
- Sylvia LG, Peters AT, Deckersbach T, Nierenberg AA. Nutrient-based therapies for bipolar disorder: a systematic review. Psychother Psychosom. 2013;82(1):10-19. PMID 23147067
Stack Score
How this pair moves the number.
Effect on the composite score
If both Valproic Acid and Vitamin B9 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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