NutriStack
5-HTP and SSRIs/SNRIs/MAOIs, contraindicated.
5-HTP increases serotonin synthesis and can combine dangerously with serotonergic antidepressants or MAO inhibitors, increasing serotonin syndrome risk.
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
- 5-HTP and SSRIs/SNRIs/MAOIs
- Pair type
- Contraindicated
- Evidence (highest tier)
- Strong
- Source citations
- 1 source
- Stack Score effect
- −25 to your Stack Score (per scored contraindication row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Contraindicated · Strong evidence
Contraindicated
What is happening. 5-HTP increases serotonin synthesis and can combine dangerously with serotonergic antidepressants or MAO inhibitors, increasing serotonin syndrome risk.
Mechanism. 5-HTP bypasses the rate-limiting tryptophan hydroxylase step and increases serotonin production. SSRIs/SNRIs reduce serotonin reuptake and MAOIs reduce monoamine breakdown, creating additive serotonergic excess.
Recommendation. Do NOT combine 5-HTP with SSRIs, SNRIs, MAOIs, or other serotonergic medications unless specifically directed by the prescriber managing the medication.
Sources (1)
Stack Score
How this pair moves the number.
Effect on the composite score
If both 5-HTP and SSRIs/SNRIs/MAOIs 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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