NutriStack
Desvenlafaxine and L-Tryptophan, contraindicated.
Desvenlafaxine is an SNRI with meaningful serotonin reuptake inhibition, and L-tryptophan is converted into serotonin. Supplemental L-tryptophan can add serotonergic drive to desvenlafaxine and raise the risk of serotonin syndrome. The concern is concentrated supplementation, not normal protein intake.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- Desvenlafaxine and L-Tryptophan
- Pair type
- Contraindicated
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- −25 to your Stack Score (per scored contraindication row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Contraindicated · Moderate evidence
Contraindicated
What is happening. Desvenlafaxine is an SNRI with meaningful serotonin reuptake inhibition, and L-tryptophan is converted into serotonin. Supplemental L-tryptophan can add serotonergic drive to desvenlafaxine and raise the risk of serotonin syndrome. The concern is concentrated supplementation, not normal protein intake.
Mechanism. L-Tryptophan is converted to 5-HTP and then serotonin, increasing serotonin synthesis capacity. Desvenlafaxine inhibits SERT and NET, decreasing serotonin reuptake while precursor availability is increased.
Recommendation. Do not use L-tryptophan supplements while taking desvenlafaxine. Choose a non-serotonergic sleep or mood support option if needed. If you accidentally combine them, stop the supplement and monitor for agitation, tremor, sweating, diarrhea, fever, or clonus.
Sources (3)
- Boyer EW, Shannon M. The serotonin syndrome. N Engl J Med. 2005;352(11):1112-1120. PMID 15784664
- Young SN. Use of tryptophan in combination with other antidepressant treatments: a review. J Psychiatry Neurosci. 1991;16(5):241-246. PMID 1797098
- Sansone RA, Sansone LA. Serotonin norepinephrine reuptake inhibitors: a pharmacological comparison. Innov Clin Neurosci. 2014;11(3-4):37-42. PMID 24800132
Stack Score
How this pair moves the number.
Effect on the composite score
If both Desvenlafaxine and L-Tryptophan are in the same stack, this pair applies −25 to your Stack Score (per scored contraindication row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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