EPA and DHA are essential marine fats from fish and algae. Their most solid benefit is lowering blood triglycerides, in proportion to dose. Signals for mood, thinking, muscle, and inflammation are modest, while heart protection is genuinely contested. Higher intakes raise irregular-heartbeat and bleeding risk, and many products are rancid, so freshness and quality matter. (Full Review)

Protocol

Standard maintenance dose

1–2 g/day EPA + DHA

With food; many titrate to an omega-3 index of 8–12% rather than a fixed dose.

Form selection

Triglyceride form

Re-esterified or natural triglyceride is generally better absorbed than ethyl ester.

Best time of day

With largest fatty meal

Timing is flexible; splitting doses across meals reduces gastrointestinal upset.

Time to effect

Triglyceride changes

A few weeks

Triglyceride reductions can appear within a few weeks of starting.

Omega-3 index

3–4 months

Full membrane incorporation and steady-state blood levels take roughly 3–4 months.

Mood & cognition

Weeks to months

Mood and cognitive effects, where present, build over weeks to months.

Benefits

High: Triglyceride reduction; heart attack & coronary event reduction, conflicted

Medium: Mood & depressive symptom improvement; cognitive & executive function support in aging; muscle mass & physical performance in older adults

Low: Inflammatory marker reduction; rheumatoid arthritis symptom relief

Speculative: Lifespan extension & all-cause mortality; slowing of biological aging markers

Contraindications

Known bleeding disorder

Full anticoagulation

Surgery within 1–2 weeks (especially high-dose EPA)

History of atrial fibrillation at doses above 1 g/day

Fish or shellfish allergy (fish-derived products)

Key Interactions

Anticoagulants & antiplatelet drugs (warfarin, apixaban, rivaroxaban, aspirin, clopidogrel)

Antihypertensive drugs (lisinopril, losartan)

OTC NSAIDs (ibuprofen, naproxen, aspirin)

Other BP- or triglyceride-lowering supplements (garlic, nattokinase, high-dose vitamin E, niacin, red yeast rice)

Orlistat & bile-acid sequestrants

Statins & prescription fibrates

Risk & Side Effects

High: Atrial fibrillation; gastrointestinal & reflux symptoms

Medium: Increased bleeding risk

Low: Oxidation & rancidity exposure; LDL cholesterol increase

Speculative: Excess intake & immune suppression; contaminant exposure

Monitoring

Marker	Target	Why
Omega-3 Index (RBC EPA+DHA %)	8–12%	Direct measure of tissue omega-3 status and response to dosing
Triglycerides	< 80 mg/dL (functional); < 150 mg/dL conventional	Primary, most robust effect of EPA/DHA
LDL Cholesterol (or LDL particle number)	LDL-C < 100 mg/dL (individualized)	DHA-containing products can modestly raise LDL
hs-CRP	< 1.0 mg/L	Tracks the anti-inflammatory effect
Fasting Glucose / HbA1c	Glucose < 90 mg/dL; HbA1c < 5.4%	Context for overall metabolic health and cardiovascular risk

Cadence: Baseline, then at ~3–4 months once membrane levels stabilize, then every 6–12 months (more often at high doses or when managing triglycerides or anticoagulation).

Qualitative Assessment

Mood stability and reduced low-mood episodes (especially with EPA-dominant dosing)
Cognitive clarity and focus
Joint comfort and reduced stiffness in those with inflammatory joint issues
Energy and exercise recovery
Absence of bothersome side effects such as reflux, fishy burps, or easy bruising

EPA & DHA for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment