What kind of interaction is it?

Caution: an interaction that may reduce efficacy or raise side-effect risk and warrants monitoring.

Is this interaction backed by published research?

Yes. NutriStack lists 2 citation rows for the Fish Oil + Sertraline pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Interaction databaseSupplement × PrescriptionReviewed May 2026

Fish Oil and Sertraline, a caution.

Q: Can I take Fish Oil and Sertraline together?

Possibly, but with caution. Fish Oil and Sertraline have a documented caution-tier interaction. Sertraline depletes platelet serotonin stores and impairs platelet aggregation, raising bleeding risk by roughly 40-55% across observational studies. Fish oil (high-dose EPA/DHA) adds modest, dose-dependent antiplatelet activity. Combined use compounds bleeding risk, particularly with concurrent NSAIDs, aspirin, or anticoagulants.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

Sertraline depletes platelet serotonin stores and impairs platelet aggregation, raising bleeding risk by roughly 40-55% across observational studies. Fish oil (high-dose EPA/DHA) adds modest, dose-dependent antiplatelet activity. Combined use compounds bleeding risk, particularly with concurrent NSAIDs, aspirin, or anticoagulants.

2 primary source citations. Moderate evidence. Last verified May 30, 2026.

Open the interaction checker →Read the methodology

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.

Sourcing standards·Evidence tiers

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: Fish Oil and Sertraline
Pair type: Caution
Evidence (highest tier): Moderate
Source citations: 2 sources
Stack Score effect: −5 to your Stack Score (per scored caution row).
Scope: Supplement × Prescription
Last verified: May 30, 2026

Caution · Moderate evidence

Caution

What is happening. Sertraline depletes platelet serotonin stores and impairs platelet aggregation, raising bleeding risk by roughly 40-55% across observational studies. Fish oil (high-dose EPA/DHA) adds modest, dose-dependent antiplatelet activity. Combined use compounds bleeding risk, particularly with concurrent NSAIDs, aspirin, or anticoagulants.

Mechanism. SSRIs block the platelet serotonin transporter, depleting intra-platelet serotonin stores needed for full aggregation responses to ADP, collagen, and epinephrine. EPA and DHA from fish oil decrease thromboxane A2 production and increase bleeding time in a dose-dependent way.

Recommendation. Low-dose fish oil (1g/day or less) is usually fine alongside sertraline. Avoid high-dose fish oil (over 3g/day EPA+DHA) unless your prescriber agrees, and watch for unusual bruising, nosebleeds, or GI bleeding. Stop fish oil at least 7 days before surgery.

Sources (2)

Stack Score

How this pair moves the number.

Effect on the composite score

If both Fish Oil and Sertraline are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).

The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.

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