What Is DPA?
Docosapentaenoic acid (DPA, 22:5n-3) is an omega-3 fatty acid that falls chemically between EPA and DHA. While EPA has 20 carbons and 5 double bonds and DHA has 22 carbons and 6 double bonds, DPA has 22 carbons and 5 double bonds. This "in-between" position gives DPA unique properties (Kaur et al., 2011).
While EPA and DHA get most of the attention, DPA is actually the third most abundant omega-3 fatty acid in human blood — typically making up about half of EPA levels.
Who This Guide Is For
This article is for those who have encountered a DHA+DPA combination on a supplement label and want to understand whether it differs from regular fish oil and when this choice makes sense.
TL;DR
- DPA is the third important omega-3 fatty acid after EPA and DHA
- DPA has unique anti-inflammatory properties that EPA and DHA don't offer (Kaur et al., 2011)
- DPA acts as a "reservoir" between EPA and DHA — the body can convert it in both directions (Guo et al., 2020)
- Seal oil and shark meat are the highest DPA sources
- Research is significantly more limited than for EPA and DHA
- Dedicated DPA supplements are more expensive and harder to find
DPA's Unique Properties
DPA stands out from other omega-3 fatty acids in several ways:
Reservoir Function
The body can convert DPA into both EPA and DHA as needed (Guo et al., 2020). This means DPA acts as a kind of omega-3 "reserve" that the body can deploy wherever a deficiency exists. Neither EPA nor DHA is this flexible.
Different Inflammation Mediators
DPA gives rise to specialized pro-resolving mediators — resolvin D5, maresin-like compounds, and protectin DX — that differ from those of EPA and DHA (Kaur et al., 2011). These compounds participate in specific inflammation-resolution pathways that only DPA can activate.
Longer Blood Persistence
DPA circulates in the blood longer than EPA. This means DPA maintains its biological activity for a longer period, which may matter for chronic inflammatory processes (Drouin et al., 2019).
What the Research Shows
Miller et al. (2014) in a meta-analysis found that higher blood DPA levels are associated with lower cardiovascular disease risk — even after accounting for EPA and DHA effects. This suggests DPA has an independent protective effect.
Drouin et al. (2019) in a review confirmed that DPA possesses unique biological functions that are not merely a repetition of EPA or DHA effects.
DPA Sources
| Source | DPA Content (per 100g) | Notes |
|---|---|---|
| Seal oil | 4,000-5,000 mg | Highest DPA source, limited availability |
| Salmon | 300-400 mg | Good source |
| Mackerel | 200-300 mg | Moderate |
| Herring | 100-200 mg | Moderate |
| Sardines | 100-200 mg | Moderate |
| Grass-fed beef | 30-50 mg | Small amount |
Most fish oil supplements contain small amounts of DPA (typically 30-100 mg per serving), but this is rarely highlighted on the label.
DHA+DPA vs DHA+EPA: Which to Choose?
| Criterion | DHA+DPA | DHA+EPA |
|---|---|---|
| Evidence base | Growing but limited | Extensive (thousands of studies) |
| EFSA-approved claims | No | Yes (250 mg DHA+EPA) |
| Anti-inflammatory | Unique pathways | Well-proven |
| Price | More expensive | More affordable |
| Availability | Limited | Wide selection |
| Best use | Addition to regular omega-3 | Primary omega-3 supplement |
Practical recommendation: DHA+EPA remains the primary choice due to its significantly stronger evidence base and EFSA approval. DHA+DPA is an interesting addition but not a replacement.
Common Mistakes
1. Treating DPA as an EPA replacement — DPA has unique properties but doesn't cover all EPA functions. Ideally, get all three.
2. Buying a more expensive product just for DPA — if your budget is limited, standard DHA+EPA fish oil is a better value.
3. DPA overdosing — more research is needed to determine optimal doses. Don't exceed manufacturer recommendations.
4. Not checking quality of DPA products — since DPA products are niche, quality control is even more important.
Frequently Asked Questions
How much DPA do I need per day?
Unlike EPA and DHA, there is no official recommended intake for DPA. Studies typically use 200-500 mg DPA per day. Most fish oil supplements provide 30-100 mg DPA per serving.
Is DPA safe?
Yes, DPA is a natural omega-3 fatty acid that humans have consumed through fish and meat throughout history. The safety profile is similar to that of EPA and DHA.
Do I get enough DPA from regular fish oil?
Regular fish oil provides a small amount of DPA (30-100 mg). If you want a higher dose, look for DPA-enriched fish oil or seal oil specifically.
Is DPA suitable for vegans?
Currently, vegan DPA sources are very limited. Some algae oils contain DPA, but most focus on DHA.
Estonia Context
DPA-rich supplements are niche products in Estonia. Regular fish oil (DHA+EPA) is much easier and cheaper to find. The DPA naturally present in the Estonian diet comes mainly from fish — especially salmon and mackerel. If you eat fish 2-3 times per week, you likely get adequate DPA from natural food.
Summary
DPA is the omega-3 family's "third member" with genuinely unique properties — including its reservoir function between EPA and DHA and distinct anti-inflammatory pathways. The science is still in early stages, but initial results are promising. At present, buying DPA separately isn't necessary for most people — regular fish oil and regular fish consumption provide enough. But keep an eye on this field — DPA research is growing rapidly.
References
1. Kaur G, Cameron-Smith D, Garg M, Sinclair AJ. (2011). Docosapentaenoic acid (22:5n-3): a review of its biological effects. Progress in Lipid Research, 50(1), 28-34.
2. Guo XF, Tong WF, Ruan Y, Sinclair AJ, Li D. (2020). Different metabolism of EPA, DPA and DHA in humans: a double-blind cross-over study. Prostaglandins, Leukotrienes and Essential Fatty Acids, 158, 102033.
3. Miller PE, Van Elswyk M, Alexander DD. (2014). Long-chain omega-3 fatty acids eicosapentaenoic acid and docosahexaenoic acid and blood pressure: a meta-analysis of randomized controlled trials. American Journal of Hypertension, 27(7), 885-896.
4. Drouin G, Rioux V, Legrand P. (2019). The n-3 docosapentaenoic acid (DPA): a new player in the n-3 long chain polyunsaturated fatty acid family. Biochimie, 159, 36-48.
5. Mozaffarian D, Wu JH. (2011). Omega-3 fatty acids and cardiovascular disease: effects on risk factors, molecular pathways, and clinical events. Journal of the American College of Cardiology, 58(20), 2047-2067.
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