Can my body make its own omega-3s?

Only partially, and inefficiently. Your body can convert ALA (from plant sources like flaxseed and walnuts) into small amounts of EPA and DHA, but the conversion rate is low, often under 10%. That's why direct sources of EPA/DHA — mainly fatty fish — matter separately from ALA intake, especially for anyone who doesn't eat fish.

Is fish oil actually good for the heart?

The evidence is more mixed than supplement marketing suggests. Omega-3s clearly matter for baseline health, but large trials on fish oil supplements for preventing heart attacks in the general population have shown inconsistent results. The strongest evidence is for people with actual high triglycerides, prescribed at doses well above typical over-the-counter supplements.

Omega-3 Deficiency Test: Check Your Symptoms Online

Based on NIH Office of Dietary Supplements guidance · Last reviewed: July 15, 2026 · How we source our content

Omega-3 deficiency is less about a dramatic clinical syndrome and more about a slow accumulation of low-grade symptoms — dry skin, joints that feel stiffer than they should, a mental fuzziness that's hard to pin down. Most people in Western diets aren't severely deficient, but a large share are running well below optimal, and the gap between "not deficient" and "adequate" is where these symptoms tend to live.

Dry skin, brain fog, stiff joints?

Our free assessment weighs your symptoms and diet in about 2 minutes.

What low omega-3 tends to look like

Dry, flaky skin — omega-3s are structural components of skin cell membranes
Dry eyes — a similar mechanism to skin dryness
Brittle hair and nails
Joint pain or stiffness — omega-3s have anti-inflammatory effects that help offset everyday joint wear
Brain fog and poor concentration — DHA is a major structural fat in the brain
Low mood — one of the more studied links, though the evidence is still developing

None of these are specific to omega-3 on their own — that's exactly why diet pattern matters as much as symptoms when assessing risk.

Who's actually at risk

People who rarely or never eat fish

Fatty fish is by far the most direct, efficient source of EPA and DHA — the two forms your body uses most readily.

Vegans and vegetarians

Plant sources provide ALA, which the body converts to EPA/DHA at a low, often under-10% rate — algae-based supplements close this gap directly.

Diets high in processed and fried food

These tend to be heavy in omega-6 fats, which compete with omega-3s for the same metabolic pathways.

Pregnant and breastfeeding people

DHA demand rises significantly to support fetal and infant brain development.

Where our test fits

There's no routine blood test for omega-3 status — it's essentially never ordered outside research settings — so diet pattern is the most reliable signal available. Our free assessment weighs your fish and plant-fat intake against your reported symptoms, and checks whether brain fog or low mood might better fit vitamin D or B12 deficiency, both of which produce overlapping mental-clarity symptoms through entirely different mechanisms.

If you are low

Fatty fish — salmon, mackerel, sardines, anchovies — deliver EPA and DHA directly, twice a week is a commonly cited target. Flaxseed, chia seeds and walnuts provide ALA for anyone not eating fish, though the conversion inefficiency means algae-based EPA/DHA supplements are a more direct option for vegans. A combined EPA+DHA intake of 250–500 mg/day is a reasonable general target, with ALA intake around 1.6 g/day (men) or 1.1 g/day (women) on top of that.

Medical disclaimer: This page and our assessment are educational tools, not medical advice or diagnosis. If joint pain, mood changes or fatigue are significant or persistent, talk to your doctor rather than relying on diet changes alone.

Frequently asked questions

Only partially, and inefficiently. Your body can convert ALA (from flaxseed, walnuts) into small amounts of EPA and DHA, but the conversion rate is often under 10%. That's why direct EPA/DHA sources — mainly fatty fish — matter separately from ALA intake, especially if you don't eat fish.

Yes, functionally. Algae is the original source of EPA and DHA in the marine food chain — fish accumulate it by eating algae. Algae-based supplements deliver the same EPA and DHA directly, making them a genuinely equivalent option for vegans and vegetarians.

Omega-6 fats (common in vegetable oils and processed food) and omega-3 fats compete for the same processing enzymes. A diet very high in omega-6 relative to omega-3 — common in Western processed-food diets — can worsen the practical effects of low omega-3 intake even when absolute intake looks borderline adequate.

The evidence is more mixed than supplement marketing suggests. Omega-3s clearly matter for baseline health, but large trials on fish oil supplements for preventing heart attacks in the general population show inconsistent results. The strongest evidence is for people with actual high triglycerides, at prescribed doses above typical over-the-counter supplements.

Find out in 2 minutes

Free omega-3 risk check — no email, no payment, no blood draw.