NutriStack
Fish Oil and Methotrexate, a synergy.
Fish oil (EPA/DHA) may have additive anti-inflammatory effects when combined with methotrexate for rheumatic conditions. Some studies suggest that omega-3 supplementation may allow reduced NSAID use in patients on MTX, improving overall tolerability of the treatment regimen.
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
- Fish Oil and Methotrexate
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 4 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Moderate evidence
Synergy
What is happening. Fish oil (EPA/DHA) may have additive anti-inflammatory effects when combined with methotrexate for rheumatic conditions. Some studies suggest that omega-3 supplementation may allow reduced NSAID use in patients on MTX, improving overall tolerability of the treatment regimen.
Mechanism. EPA and DHA reduce pro-inflammatory eicosanoid production (prostaglandins, leukotrienes) by competing with arachidonic acid for cyclooxygenase and lipoxygenase enzymes. They also generate specialized pro-resolving mediators (resolvins, protectins) that complement MTX's anti-inflammatory effect.
Recommendation. Fish oil supplementation (2-3g EPA+DHA/day) may be a beneficial adjunct to methotrexate therapy for inflammatory conditions. No timing separation is needed. Discuss with your rheumatologist.
Sources (4)
- Kremer JM et al. Effects of high-dose fish oil on rheumatoid arthritis after stopping nonsteroidal antiinflammatory drugs. Arthritis Rheum. 1995;38(8):1107-1114. PMID 7639807
- Liao Y, Xie B, Zhang H et al.. Efficacy of omega-3 PUFAs in depression: A meta-analysis.. Translational Psychiatry. 2019. PMID 31383846
- Wei BZ, Li L, Dong CW et al.. The Relationship of Omega-3 Fatty Acids with Dementia and Cognitive Decline: Evidence from Prospective Cohort Studies of Supplementation, Dietary Intake, and Blood Markers.. American Journal of Clinical Nutrition. 2023. PMID 37028557
- Uchida Y, Tsuji K, Ochi E. Effects of Omega-3 fatty acids supplementation and resistance training on skeletal muscle.. Clinical Nutrition ESPEN. 2024. PMID 38777432
Stack Score
How this pair moves the number.
Effect on the composite score
If both Fish Oil and Methotrexate 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 documented at /methodology/stack-score.
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