We compared 15+ omega-3 and fish oil products available from Australian retailers on EPA/DHA content, form, price per serve, and clinical evidence. Here are the results.
The terms "fish oil" and "omega-3" are used interchangeably, but they are not the same thing.
Omega-3 is a family of polyunsaturated fatty acids. The three main types are:
Fish oil is a source of EPA and DHA. A standard "1000 mg fish oil" capsule typically contains just 180 mg EPA + 120 mg DHA — the remaining 700 mg is other fats. The active ingredients are EPA and DHA, not the total oil weight.
This distinction matters when comparing products. A "1000 mg fish oil" capsule with 300 mg EPA+DHA is vastly different from a concentrated capsule providing 900 mg EPA+DHA in the same size softgel. Always check the Supplement Facts panel for EPA and DHA amounts per serve.
Only about 20% of Australians meet recommended omega-3 long-chain PUFA intakes, according to research published in Nutrients (2016). Among women of childbearing age, only 10% meet recommended DHA intake.
Australian dietary targets (NHMRC):
Therapeutic doses from clinical trials:
| Goal | Dose (EPA+DHA/day) | Evidence |
|------|-------------------|----------|
| General health | 250-500 mg | Observational data |
| Cardiovascular risk | 2-4 g | REDUCE-IT trial (NEJM, 2019) |
| Depression/mood | 1-2 g EPA | Meta-analysis, Transl Psychiatry 2019 |
| Joint inflammation | 2.7 g | Arthritis Australia recommendation |
| Triglyceride reduction | 2-4 g | Multiple RCTs |
| Pregnancy (brain dev.) | 500+ mg DHA | NHMRC + international consensus |
At standard fish oil concentrations (30% EPA+DHA), hitting therapeutic doses means taking 4-8 capsules daily. Concentrated formulations (60-90% EPA+DHA) reduce this to 1-3 capsules.
1. EPA and DHA per serve — not total fish oil
A product advertising "1500 mg fish oil" might deliver only 450 mg EPA+DHA. Always check the actual EPA and DHA amounts in the Supplement Facts panel.
2. Molecular form matters
3. TGA listing (AUST L number)
In Australia, supplements must be listed with the Therapeutic Goods Administration. An AUST L number confirms the product meets Australian safety and quality standards. International products purchased from iHerb may not have TGA listing but are regulated by their country of origin (e.g., FDA in the US).
4. Third-party testing
IFOS (International Fish Oil Standards) certification is the gold standard for fish oil purity testing. It checks for oxidation levels, heavy metals (mercury, lead, PCBs), and actual EPA/DHA content versus label claims.
5. Oxidation markers
Rancid fish oil may be ineffective or harmful. Signs of oxidation: strong fishy smell when capsule is cut, cloudy appearance, or past expiry date. Store fish oil in a cool, dark place and refrigerate after opening.
6. Price per serve of EPA+DHA
This is the only fair comparison metric. A cheap bottle with low EPA+DHA per capsule can end up costing more per effective dose than a pricier concentrated product.
We track omega-3 product prices across 10+ Australian supplement retailers in real-time. Here is what the landscape looks like:
Where to find the cheapest omega-3 in Australia:
For a live, side-by-side price comparison of omega-3 products available in Australia, sorted by price per serve, visit our [omega-3 supplement page](/supplements/omega-3). We compare products from all major Australian retailers so you can find the best value.
The price-per-serve trap: A $15 bottle of fish oil with 100 capsules at 300 mg EPA+DHA costs $0.15/serve — but you need 3 capsules for a therapeutic dose, making the real cost $0.45/day. A $30 bottle of concentrated omega-3 with 60 capsules at 900 mg EPA+DHA costs $0.50/serve — but one capsule is a full dose. Compare the cost of getting your target dose, not the cost per capsule.
Heart health and cardiovascular risk
The REDUCE-IT trial (Bhatt et al., NEJM 2019) showed that 4 g/day of icosapent ethyl (high-purity EPA) reduced cardiovascular events by 25% in patients with elevated triglycerides. This was a landmark trial that led to TGA approval of Vascepa in Australia for triglyceride reduction. For general cardiovascular support, the evidence is strongest at doses of 2-4 g EPA+DHA daily.
Joint pain and inflammation
Arthritis Australia recommends 2.7 g combined EPA+DHA daily for rheumatoid arthritis. A 2017 meta-analysis in Annals of the Rheumatic Diseases found that omega-3 supplementation significantly reduced joint pain intensity, morning stiffness, and NSAID use in RA patients. Effects typically take 2-3 months to become noticeable.
Depression and mood
EPA appears to be the active component for mood. A 2019 meta-analysis of 26 RCTs found that formulations with >60% EPA were significantly effective for depression, while DHA-dominant formulations were not. Effective doses range from 1-2 g EPA daily.
Brain health and cognition
DHA is the predominant omega-3 in brain tissue. Observational studies consistently link higher omega-3 intake with reduced cognitive decline, but RCT evidence for treating existing dementia is mixed. The evidence is strongest for prevention rather than treatment.
Pregnancy and fetal development
DHA is critical for fetal brain and eye development, particularly in the third trimester. Australian dietary guidelines recommend at least 200 mg DHA daily during pregnancy, though many experts recommend 500+ mg. Low-mercury sources are essential — look for products specifically tested for heavy metals.
Plant-based sources like flaxseed oil, chia seeds, and walnuts provide ALA omega-3. However, the human body converts ALA to EPA at only 5-10% efficiency, and to DHA at less than 0.5%. This means you would need to consume roughly 10-20 g of ALA to get 1 g of EPA — impractical for therapeutic doses.
Algae-based omega-3 is the solution for vegans and vegetarians who need meaningful EPA and DHA intake. Marine algae are where fish get their omega-3 in the first place — supplementing with algae oil cuts out the middle fish.
Several algae-based DHA+EPA products are available from Australian retailers, typically providing 250-500 mg DHA per serve. They tend to be more expensive per mg of EPA+DHA than fish oil, but are the only viable vegan source of preformed DHA.
What about krill oil?
Krill oil provides EPA and DHA in phospholipid form, which some studies suggest improves absorption. However, the total EPA+DHA per capsule is typically much lower than fish oil (150-300 mg vs 500-900 mg), making it a more expensive way to reach therapeutic doses. Krill oil also provides astaxanthin, a potent antioxidant, which may offer additional benefits.
Omega-3 supplementation is one of the most evidence-backed interventions in nutritional science — but only at adequate doses and in the right form. For Australians looking to supplement:
1. Know your goal — General health needs 500 mg EPA+DHA/day; therapeutic uses need 2-4 g/day
2. Read the label — Check EPA and DHA per serve, not total fish oil weight
3. Choose the right form — Triglyceride or rTG for best absorption
4. Compare price per effective dose — Not price per bottle
5. Check quality markers — AUST L number, IFOS certification, freshness
Use our [AI-powered supplement finder](/results?q=omega+3+fish+oil) to get personalised omega-3 recommendations based on your specific health goals, or browse our [omega-3 price comparison](/supplements/omega-3) to find the best deal across Australian retailers.
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Take the QuizThis article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any supplement regimen.