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An omega-3 index between 4 and 8% is in the normal range for most Western populations. However, research consistently shows that the greatest brain health, mood, and cardiovascular benefits occur at levels above 8%. Even a 'normal' omega-3 index may leave room for meaningful improvement in mood stability, cognitive performance, and anti-inflammatory protection.
The Omega-3 Index measures EPA and DHA content in red blood cell membranes — reflecting true tissue omega-3 status. A very low index below 2% means cell membranes throughout the body, including in the brain, are very depleted of these essential fatty acids. DHA is the predominant fat in brain gray matter and is critical for neuronal membrane fluidity, synapse formation, and anti-inflammatory signaling. This level is associated with very elevated cardiovascular risk and significant impairment of brain function.
High-dose omega-3 supplementation (2000–4000 mg EPA+DHA daily) under medical supervision is needed. This level requires sustained correction over several months.
Omega-3 Index: {{value}}% — very deficient (ref: {{low}}–{{high}}%; critical: <2%)An omega-3 index below 4% is associated with noticeably higher rates of depression, aggression, cognitive decline, anxiety, ADHD symptoms, and poor emotional regulation. DHA is the primary structural fat of the brain and EPA has direct anti-inflammatory effects on neuroinflammation — a key driver of depression. Low omega-3 also noticeably increases cardiovascular mortality risk. Western diets are commonly deficient due to low fish intake and high omega-6 competition.
Supplement with 1000–3000 mg EPA+DHA daily from fish oil or algae oil (for vegetarians). Eat fatty fish (salmon, sardines, mackerel) 3 times per week. Retest the omega-3 index in 3–4 months.
Omega-3 Index: {{value}}% — deficient (ref: {{low}}–{{high}}%; deficient: <4%)An omega-3 index between 4 and 6% is below optimal for brain and cardiovascular health. While not very deficient, this range is associated with increased neuroinflammation, blunted mood regulation, and higher cardiovascular inflammatory risk compared to those in the optimal 8–12% range. The majority of the mood, cognitive, and cardiovascular benefits of omega-3 are seen at levels above 8%.
Increase omega-3 intake through fatty fish and supplementation. Aim for 1000–2000 mg EPA+DHA daily to push the index into the optimal range.
Omega-3 Index: {{value}}% — borderline (ref: {{low}}–{{high}}%; borderline: 4–6%)An omega-3 index between 4 and 8% is in the normal range for most Western populations. However, research consistently shows that the greatest brain health, mood, and cardiovascular benefits occur at levels above 8%. Even a 'normal' omega-3 index may leave room for meaningful improvement in mood stability, cognitive performance, and anti-inflammatory protection.
Consider optimizing to the 8–12% range through increased fatty fish consumption and omega-3 supplementation for enhanced mental health benefits.
Omega-3 Index: {{value}}% — normal (ref: 4–8%)An optimal omega-3 index above 8% reflects brain cell membranes rich in EPA and DHA, supporting optimal neuronal membrane fluidity, synaptic plasticity, anti-inflammatory signaling, and neurotransmitter sensitivity. This level is associated with lower rates of depression and anxiety, better cognitive performance across the lifespan, noticeably lower cardiovascular mortality, and better outcomes after traumatic brain injury.
Excellent result. Continue regular fatty fish consumption and omega-3 supplementation to maintain this protective level.
Omega-3 Index: {{value}}% — optimal (ref: >8%)A high-optimal omega-3 index in the upper part of the favorable range reflects excellent EPA+DHA status. Cell membranes throughout the body and brain are richly supplied with these anti-inflammatory, structurally beneficial fatty acids. This range is associated with the greatest anti-inflammatory protection, best mood support, and lowest cardiovascular risk from this marker.
Excellent result. This level represents optimal omega-3 status for health and longevity.
Omega-3 Index: {{value}}% — above optimal (ref: 8–12%; upper: 10–12%)An omega-3 index above 12% exceeds the conventional optimal range and reflects very high EPA+DHA incorporation into cell membranes. This level is typically seen only in people consuming large amounts of fatty fish or taking high-dose omega-3 supplements. Very high omega-3 status is generally safe and may not provide additional benefits over the 8–12% optimal range, but is not harmful at these levels.
No concern at this level. You may slightly reduce supplement doses to maintain the 8–12% optimal range more stably.
Omega-3 Index: {{value}}% — above reference range (ref: 8–12%; very high: >12%)An omega-3 index above 15% is very unusual and would require very aggressive supplementation with high-dose fish oil. At very high levels, potential concerns include very mild platelet aggregation effects (already modest at normal supplementation levels), but serious toxicity from dietary omega-3 is essentially not seen. This level is primarily a flag to moderate intake.
Reduce omega-3 supplementation noticeably. This level is above what provides health benefit and represents excessive supplementation.
Omega-3 Index: {{value}}% — very high (ref: 8–12%; very high: >15%)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.