The Omega-3 Counter-Fire
RHEUMATOLOGY FIREFIGHTERS — FIELD DISPATCHES
The Omega-3 Counter-Fire
Issue 06 | Nisha J. Manek, MD, FACR, FACP, FRCP | ACR Convergence Dispatch
Dear Friend,
In Issue 5, I took you inside your inner ecosystem: the trillion-strong bacterial community that manufactures vitamins, regulates your immune system, controls appetite hormones, and produces compounds that extinguish inflammation. We encountered butyrate, the short-chain fatty acid that directly inhibits Nuclear Factor Kappa-B (NF-kB), and noted that ghee is one natural source of butyrate.
Probiotics are living bacteria delivered directly into your gut through foods like yoghurt, kefir, sauerkraut, kimchi, and miso. Prebiotics are the foods your bacteria feed on, especially fiber from onions, garlic, and greens. More fiber means more thriving bacteria and greater butyrate production.
The Counter-Fire from the Ocean
One of the most common questions in clinic is: "What about fish oil? Is it good for my arthritis?" Fish oil contains EPA and DHA, marine omega-3 fatty acids with well-established anti-inflammatory mechanisms and meaningful evidence in rheumatoid arthritis.
After years of recommending fish oil, my advice has become more cautious. This is less about memorizing biochemistry and more about practical readiness: reading the equipment before the alarm sounds.
Read the Label: What Is Actually in That Capsule
Fish oil labels can reveal global sourcing and a long additive list. Some ingredients are structural and expected, while others deserve careful scrutiny. The practical takeaway is simple: do not assume all capsules are equivalent, even when front-label omega-3 numbers look similar.
Something’s Fishy: A Hose Full of Gasoline
Fish oil oxidizes over time. A rancid capsule is not merely less useful; it may drive inflammatory risk. Freshness matters enough to reverse expected benefit. Oxidation scoring (often reported as TOTOX) is one way to assess quality.
BEFORE YOU SWALLOW ANOTHER CAPSULE
Fish oil oxidises. Rancid fish oil is not a counter-fire. It is accelerant.
Slice open a capsule. Smell it.
Fresh fish oil smells mild, faintly oceanic. Rancid oil smells sharp, fishy, and acrid. If yours does, discard it.
Ethyl ester vs. triglyceride: most cheap fish oil is ethyl ester — synthetic, poorly absorbed. Look for triglyceride form. Take it with a meal. The fat in food substantially increases absorption.
Call in the inspector: Pulled from the Line
In April 2026, Consumer Reports flagged a well-known favorite brand of fish oil for signs of rancidity, and it has since disappeared from Costco’s shelves. A naturally sourced product can change lot to lot, and this one did. In ConsumerLab’s own latest testing, three products failed outright for freshness. This is a third-party independent testing lab for all kinds of supplements. The annual subscription is nominal and worth it. You can research your fish oil for TOTOX scoring.
Reference resource: www.consumerlab.com
Read the Dispatch Orders
If you eat oily fish 2-3 times/week, you probably don’t need supplements. If you do want to take fish oil, read the label. The first is patience. In rheumatoid arthritis, fish oil behaves like a disease-modifier, not a painkiller: benefit emerges over two to three months, the same slow arc as a DMARD. Stop at week three and you will wrongly conclude it failed.
The second is dose. The RA trials show 2.6 to 7.1 grams of EPA and DHA a day. This usually translates to at least 3 capsules daily. Treat marine oil like the perishable it is. Buy a size you will finish in weeks, not months. Refrigerate it once opened or freeze it if you must keep it longer.
DOCTOR, I AM A VEGETARIAN
Fish accumulate EPA and DHA by eating algae. The omega-3 originates in the algae. The fish is like the middleman.
Algae-based omega-3 supplements - algal oil - provide EPA and DHA directly from the original source. No fishy smell. No concerns about mercury.
ConsumerLab’s value pick: DEVA Vegan Omega-3.
For vegetarian and vegan patients, algal oil is the prescription.
Coming in Issue 07: The ocean inside you - more surprises in our fight against inflammation.
Nisha J. Manek, MD | FACR, FACP, FRCP | Rheumatologist
Disclaimer: This newsletter is for educational and informational purposes only and does not constitute medical advice. Please consult a qualified healthcare professional for individual recommendations.