Omega-3 EPA 2g, 12-Week IL-6 -32% TNF-α -28% Chronic Inflammation Baseline
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Omega-3 EPA 2g, 12-Week IL-6 -32% TNF-α -28% Chronic Inflammation Baseline

By Léa · · American Journal of Clinical Nutrition
KO | EN

A 12-week RCT of high-purity EPA 2,000 mg + DHA 500 mg combination simultaneously improving IL-6 and TNF-α in adults aged 40~70 with chronic low-grade inflammation has been published. The clinical position of omega-3 molecules’ anti-inflammatory baseline has been re-validated.

Clinical Data

A double-blind RCT in 200 adults aged 40~70 with chronic low-grade inflammation (hsCRP >2 mg/L) randomized 1:1 to high-purity EPA 2,000 mg + DHA 500 mg/day or placebo (olive oil). After 12 weeks, primary endpoints were IL-6 + TNF-α, secondary endpoints were hsCRP, SPM concentration, and omega-3 index.

The omega-3 arm showed:

  • IL-6 -32% (p<0.001)
  • TNF-α -28%
  • hsCRP -25%
  • Omega-3 index 4.5% → 8.2% (target 8%+)
  • SPM (resolvin, protectin) +180%
  • Triglycerides -22%

Mechanism: Passive Anti-Inflammation + Active SPM Resolution

Omega-3 works in two stages:

Stage 1: Inflammation Signal Block (Passive):

  • Arachidonic acid (AA, omega-6) competition → PGF2α, LTB4 synthesis -28~35%
  • COX-2, LOX enzyme competition
  • NF-κB activity -22%

Stage 2: SPM Active Resolution (Active):

  • EPA → resolvin E1, E2, E3
  • DHA → resolvin D1~D6, protectin D1, maresin
  • Immune cells → clearance mode (efferocytosis)
  • Tissue recovery signals

SPM (Specialized Pro-resolving Mediators) is the key. Chronic inflammation persists due to lack of resolution signals. Omega-3 synthesizes SPM + actively resolves inflammation.

Form Differences (Most Important)

Omega-3 form determines absorption and stability:

TG (Triglyceride) Form — natural, clinical standard

  • 80%+ absorption (fish oil natural form)
  • Stability (oxidation resistance)
  • Price $$$ (expensive)

EE (Ethyl Ester) Form — prescription

  • 50~60% absorption (requires fat meal)
  • Price $$ (medium)
  • Lovaza, Vascepa prescription

rTG (re-esterified TG) — concentrated natural

  • 75% absorption (similar to TG)
  • 60~85% EPA+DHA concentration
  • Price $$$

Phospholipid Form (Krill Oil)

  • 95% absorption (highest)
  • Low concentration (15~30% EPA+DHA)
  • Price $$$$

EPA+DHA per capsule by form:

  • Regular fish oil (30%): 1g capsule → 300mg EPA+DHA
  • Concentrated (60~85%): 1g capsule → 600~850mg
  • Prescription (90%+): 1g capsule → 900mg+

To reach 2g EPA, need 4~5 concentrated (60%+) capsules. 7~8 regular fish oil capsules.

EPA vs DHA Ratio

EPA Priority (Inflammation Target):

  • IL-6, TNF-α, CRP reduction
  • Depression, arthritis
  • Ratio EPA:DHA = 4:1 or EPA alone

DHA Priority (Brain·Vision):

  • Brain neuron membranes
  • Retinal photoreceptors
  • Pregnancy·lactation (fetal brain)
  • Ratio DHA:EPA = 2:1

For chronic inflammation baseline, EPA priority. Most clinical RCTs use EPA 1.5~3g.

Omega-3 Index

Omega-3 index = % of EPA + DHA in red blood cell membrane:

  • <4%: very low (Korean·US average)
  • 4~8%: medium

  • 8%: ideal (cardiovascular risk -30%)

Korean adult average 4~5%. To reach ideal 8%, need EPA+DHA 1~2g/day for 12 weeks. Difficult through food alone (fish 5+ times/week).

Natural Food EPA+DHA

High content (per 100g serving):

  • Atlantic salmon: EPA 690mg + DHA 1,460mg
  • Sardines: EPA 470mg + DHA 510mg
  • Mackerel: EPA 630mg + DHA 1,260mg
  • Herring: EPA 909mg + DHA 862mg

Medium:

  • Anchovies: EPA 200mg + DHA 320mg
  • Trout: EPA 280mg + DHA 670mg

Low (plant-based):

  • Flaxseed (ALA→EPA 5~10% conversion): EPA 0~30mg
  • Walnuts (ALA→EPA 5%): EPA 0~20mg

Plant omega-3 (ALA) has 5~10% EPA conversion efficiency. For clinical effect, fish oil or algae EPA direct supplementation needed.

Clinical Application

  • Standard dose: EPA 1,500~2,000 mg + DHA 500 mg/day (inflammation)
  • Split dose: 1g × 2~3 (absorption)
  • Absorption: with dietary fat essential
  • Form priority: rTG > TG > EE > krill (effect/price)
  • Onset: 4~8 weeks start, 12 weeks stable
  • Quality markers: IFOS 5-star, GOED, oxidation (TOTOX <26)
  • Side effects: fishy burp (rTG -80%), GI discomfort
  • Caution: high-dose anticoagulants (bleeding), fish allergy
  • Interactions: warfarin, aspirin (additive effect)
  • Synergistic matrix: curcumin + quercetin + Boswellia + resveratrol