NutriStack
L-Carnitine and Valproic Acid, a synergy.
L-carnitine is used clinically to address valproic acid-associated carnitine depletion, hyperammonemia, and toxicity risk. Valproic acid can shift mitochondrial metabolism toward toxic metabolites and impair ammonia handling, causing confusion, vomiting, lethargy, or encephalopathy in susceptible patients. This is most important with high valproate levels, overdose, liver disease, young age, poor nutrition, urea-cycle disorders, or unexplained mental-status changes.
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
- L-Carnitine and Valproic Acid
- 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. L-carnitine is used clinically to address valproic acid-associated carnitine depletion, hyperammonemia, and toxicity risk. Valproic acid can shift mitochondrial metabolism toward toxic metabolites and impair ammonia handling, causing confusion, vomiting, lethargy, or encephalopathy in susceptible patients. This is most important with high valproate levels, overdose, liver disease, young age, poor nutrition, urea-cycle disorders, or unexplained mental-status changes.
Mechanism. Valproic acid depends partly on mitochondrial beta-oxidation, a pathway supported by carnitine transport. Carnitine depletion shifts valproate metabolism toward omega-oxidation and 4-en-valproic acid formation, which can impair carbamoyl phosphate synthetase I activity and raise ammonia; L-carnitine can help restore mitochondrial handling.
Recommendation. Do not self-treat suspected valproic acid toxicity with over-the-counter L-carnitine alone. Seek urgent medical care for confusion, severe sleepiness, repeated vomiting, or sudden neurologic changes while on valproic acid. If your prescriber recommends L-carnitine, use the exact dose and continue ammonia, liver-function, valproate-level, and symptom monitoring as directed.
Sources (2)
- Lheureux PE, Penaloza A, Zahir S, Gris M. Science review: carnitine in the treatment of valproic acid-induced toxicity - what is the evidence? Crit Care. 2005;9(5):431-440. PMID 16277730
- Lheureux PE, Hantson P. Carnitine in the treatment of valproic acid-induced toxicity. Clin Toxicol (Phila). 2009;47(2):101-111. PMID 19280426
Stack Score
How this pair moves the number.
Effect on the composite score
If both L-Carnitine 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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