NutriStack
5-HTP and Sertraline, contraindicated.
5-HTP is a direct precursor to serotonin that bypasses the rate-limiting step in serotonin synthesis. When combined with sertraline's serotonin reuptake inhibition, 5-HTP can cause excessive serotonin accumulation and potentially trigger serotonin syndrome.
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At a glance
- Substances
- 5-HTP and Sertraline
- 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. 5-HTP is a direct precursor to serotonin that bypasses the rate-limiting step in serotonin synthesis. When combined with sertraline's serotonin reuptake inhibition, 5-HTP can cause excessive serotonin accumulation and potentially trigger serotonin syndrome.
Mechanism. 5-HTP is converted to serotonin by aromatic L-amino acid decarboxylase, increasing serotonin synthesis both centrally and peripherally. Sertraline prevents serotonin reuptake from the synapse. Together, increased production and decreased clearance cause dangerous synaptic serotonin accumulation.
Recommendation. Do not combine 5-HTP with sertraline. The risk of serotonin syndrome is significant. If you are taking 5-HTP, inform your prescriber before starting any SSRI.
Sources (3)
- Birdsall TC. 5-Hydroxytryptophan: a clinically-effective serotonin precursor. Altern Med Rev. 1998;3(4):271-280. PMID 9727088
- Truyens M, Lobatón T, Ferrante M et al.. Effect of 5-Hydroxytryptophan on Fatigue in Quiescent Inflammatory Bowel Disease: A Randomized Controlled Trial. Gastroenterology. 2022. PMID 35940251
- Sutanto CN, Xia X, Heng CW et al.. The impact of 5-hydroxytryptophan supplementation on sleep quality and gut microbiota composition in older adults: A randomized controlled trial. Clinical Nutrition. 2024. PMID 38309227
Stack Score
How this pair moves the number.
Effect on the composite score
If both 5-HTP and Sertraline 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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