Omega-3 Buying Guide: EPA/DHA, Dosage, and Which Product Fits You

Reviewed by Dr. Kristi Hughes, Head of Nutrition Strategy

Omega-3 fatty acids are among the most researched supplements on the market, but the sheer number of formats, concentrations, and serving sizes can make choosing one genuinely confusing. Here's how to actually compare products.

EPA vs. DHA: The Two Key Players

Fish oil supplements are measured by their content of two active omega-3s: EPA (eicosapentaenoic acid) — often associated with general wellness support. DHA (docosahexaenoic acid) — a major structural component of the brain and eyes, which is why it's emphasized in prenatal and children's formulas.

Most general-purpose fish oil products contain a combination of both, in varying ratios depending on the intended use.

How to Compare Potency

Don't just compare bottle sizes — compare milligrams of EPA+DHA per serving, since this varies enormously between products. A 1000mg fish oil softgel might only contain 300mg of actual EPA/DHA, while a concentrated formula can deliver 3–4x that in a similar-sized capsule.

Choosing by Count Size and Use Case

• 60-count bottles are a good low-commitment option for trying a new formula or for lower daily servings.
• 120-count bottles suit people taking a daily 2-capsule serving who want roughly two months of supply.
• 180-count bottles are the most economical per-serving option for consistent, long-term daily use.

Flavor and Format Matter for Compliance

Fish oil is notorious for "repeating" on some people. Flavored softgel options are specifically designed to reduce this, and can make the difference between sticking with a routine and abandoning it.

Third-Party Purity Testing

Because fish oil is sourced from ocean fish, look for products that are tested for heavy metals, PCBs, and oxidation levels — reputable brands will typically reference this on their packaging or website.

Not medical advice. Consult your healthcare provider before starting fish oil supplementation, particularly if you take blood-thinning medication.