Omega-3 Monograph: rTG vs. EE Bioavailability, Oxidation & Dose Thresholds
A “1,000 mg fish oil” capsule containing only 300 mg of combined EPA+DHA delivers mostly filler fatty acids. Clinical efficacy depends on net EPA+DHA concentration, chemical ester form, and oxidative stability.
Total Capsule Weight vs. Net Combined EPA + DHA Milligrams
First-generation natural TG oils had low purity (~30%), while second-generation Ethyl Esters (EE) required pancreatic carboxylesterase cleavage. Third-generation rTG restores the glycerol backbone at 75–85% purity for rapid chylomicron incorporation.
Step-by-Step Evaluation & Dosing Protocol
Verify Net EPA + DHA Milligrams
General maintenance and tear-film stability typically use 600–1,000 mg/day of EPA+DHA, whereas triglyceride lowering requires 1,000–2,000+ mg/day.
Check Blister Packaging & Rancidity Signs
Choose individual foil blister packs over bulk jars; discard capsules that stick together, turn cloudy, or emit a sharp rancid odor.
Prefer Small Pelagic Fish or Microalgae Sources
Oil derived from short-lived small fish (anchovy, sardine) or cultivated Schizochytrium microalgae minimizes bioaccumulated mercury and PCBs.
Dose Immediately After Dinner & Monitor High-Dose Risks
Take immediately after dinner; doses exceeding 3–4 g/day require medical supervision due to antiplatelet effects and atrial fibrillation risk in high-risk cohorts.
1. EPA-Dominant vs. DHA-Dominant Formulations
EPA preferentially modulates eicosanoid inflammatory cascades and hepatic VLDL triglyceride synthesis, whereas DHA is structurally concentrated in retinal photoreceptors and synaptic membranes.
Comparison of Omega-3 Chemical Forms (TG, EE, rTG, Algal)
| Formulation | Typical Purity | Bioavailability | Best Suited For |
|---|---|---|---|
| 1st Gen Natural TG | 30–35% (Low) | High | Largely superseded due to high non-active fat load |
| 2nd Gen Ethyl Ester (EE) | 60–80% (High) | Moderate (requires high-fat meal) | Cost-effective if strictly taken with fatty meals |
| 3rd Gen Re-Esterified (rTG) | 75–85% (High) | Very High | Optimal balance of potency, small capsule count, and GI ease |
| Microalgae Algal rTG | 50–75% (DHA-rich) | High | Pregnancy, vegans, fish allergy, zero marine heavy-metal concern |
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Should Omega-3 capsules be refrigerated?
Store blister-packed capsules in a cool, dark cabinet (<25°C); repeatedly opening a bulk bottle from the refrigerator introduces condensation that accelerates oxidation.
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