What Is DPA Supplement? | The Third Omega-3 Explained

Most omega-3 talk centers on EPA and DHA, but DPA is the third, lesser-known fatty acid that comes along with them in fish oil and other marine sources. It’s not the star of the show, but it plays a supporting role worth understanding before you pick a supplement.

What Exactly Is DPA?

DPA stands for docosapentaenoic acid, a long-chain omega-3 fatty acid also written as 22:5n-3. It’s the metabolic middle child between EPA and DHA: your body can convert EPA to DPA and DPA to DHA. Some researchers describe DPA as a reservoir for the other two fatty acids.

Chemically, it’s all-cis-4,7,10,13,16-docosapentaenoic acid. You don’t need to remember that, but it explains why DPA appears in labs and product labels under several names.

DPA shows up in fatty fish, fish oil, krill oil, seal oil, and some algal oils. In most standard omega-3 products, it’s present in smaller amounts than EPA and DHA, which is why you rarely hear about it.

What Does The Research Say About DPA?

Scientists have studied DPA for roles in inflammation, platelet function, lipid metabolism, and blood vessel biology. The evidence base is real but thinner than what exists for EPA and DHA.

The key limitation: there is no standalone human trial of purified DPA supplementation. A scientific review in the U.S. National Library of Medicine notes that no clinically validated DPA-specific dose or duration exists because no randomized controlled trial has tested isolated DPA on its own. Researchers generally expect DPA safety to parallel other long-chain omega-3s, with mild stomach upset as the typical side effect.

What this means practically: DPA is promising, but it’s not the best-researched omega-3. Most of what we know comes from studies of combined omega-3 products where DPA was part of the mix, not the active ingredient under the microscope.

How Much DPA Is In Common Supplements?

DPA amounts vary widely by product. Standard fish oils often carry modest DPA, while specially formulated “high-DPA” products push it higher. Here’s what some labeled products show:

As you can see, “DPA supplement” usually means an omega-3 product where DPA is one ingredient among several, not the sole active.

Should You Take A DPA Supplement?

There’s no official recommended daily allowance for DPA, and no supplement label can claim a validated DPA-specific dose. If you’re choosing an omega-3, the practical question is whether DPA adds enough value to justify seeking it out. The evidence suggests it may contribute, but EPA and DHA remain the better-studied workhorses.

If you do want DPA in your routine, look for products that list it on the label. The Carlson liquid is a straightforward option at 300 mg per teaspoon, taken once or twice daily with meals. Fish-based products carry fish allergens — Carlson’s label notes anchovy, sardine, and mackerel — so plant-based alternatives like the Freshfield option exist if that matters to you. If you’re on blood-thinning medication or have bleeding concerns, talk to your doctor before adding any omega-3, DPA included.

One thing to watch: DPA gets confused with DLPA, which is DL-phenylalanine, an amino acid supplement. Entirely different compound, entirely different purpose.

For a roundup of top-rated options and what to look for when comparing labels, our DPA supplement picks and buying guidance walks through the current market.