What kind of interaction is it?

Synergy: a documented combination effect that is stronger or more useful than either substance taken alone.

Is this interaction backed by published research?

Yes. NutriStack lists 1 citation row for the Fish Oil + Niacin (Prescription) pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Prescription·a synergy·Moderate evidence

Fish Oil + Niacin (Prescription)

Q: Can I take Fish Oil and Niacin (Prescription) together?

Yes. The combination of Fish Oil and Niacin (Prescription) produces a measurable benefit. Prescription niacin and fish oil (omega-3 fatty acids EPA/DHA) both lower triglycerides through complementary mechanisms and are sometimes used together for hypertriglyceridemia. The combination is generally well tolerated, though both can have mild effects on glucose and platelet function, so monitoring is still appropriate.

Q: How does this affect a NutriStack Stack Score?

+2 to your Stack Score per scored synergy row.

Synergy Moderate evidence

Prescription niacin and fish oil (omega-3 fatty acids EPA/DHA) both lower triglycerides through complementary mechanisms and are sometimes used together for hypertriglyceridemia. The combination is generally well tolerated, though both can have mild effects on glucose and platelet function, so monitoring is still appropriate.

Supplement × Prescription

Open the interaction checker → Read the methodology

From the database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, and the recommendation.

Substances

Fish Oil and Niacin (Prescription)

Pair type

Synergy

Evidence

Moderate

Source citations

Scope

Supplement × Prescription

Last verified

June 4, 2026

SynergyModerate evidence

What is happening. Prescription niacin and fish oil (omega-3 fatty acids EPA/DHA) both lower triglycerides through complementary mechanisms and are sometimes used together for hypertriglyceridemia. The combination is generally well tolerated, though both can have mild effects on glucose and platelet function, so monitoring is still appropriate.

Mechanism. Nicotinic acid reduces hepatic VLDL/triglyceride synthesis by inhibiting lipolysis and diacylglycerol acyltransferase, while omega-3 fatty acids decrease hepatic triglyceride production and increase fatty acid oxidation. The mechanisms are complementary, giving additive triglyceride lowering.

Recommendation. Concurrent use can be reasonable for triglyceride lowering under clinician guidance. Monitor lipids and, in diabetic patients, glucose. There is no required dose separation. Watch for additive bruising or bleeding tendency if other antiplatelet or anticoagulant agents are also used.

Stack Score

How it moves the number.

Effect on the composite score

If both Fish Oil and Niacin (Prescription) 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 at /methodology/stack-score.

Sources

Sources, by evidence tier.

Every claim on this page is cited. PMIDs link straight to PubMed.

Reference material

1Skulas-Ray AC, Wilson PWF, Harris WS, et al. Omega-3 Fatty Acids for the Management of Hypertriglyceridemia: A Science Advisory From the American Heart Association. Circulation. 2019.Needs sourceNo link

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