Omega-3 fatty acids—particularly DHA—are among the most important supplements you can take when trying to conceive and during pregnancy. These essential fats support fertility, hormone production, and are absolutely critical for your baby's brain and eye development.
The challenge? Most women don't get enough omega-3s from diet alone, and not all supplements are created equal. In this guide, we'll break down what to look for in an omega-3 supplement and compare the best options for fertility and pregnancy.
Why Omega-3s Matter for Fertility and Pregnancy
Omega-3 fatty acids are called "essential" because your body can't make them—you have to get them from food or supplements. The two most important omega-3s for fertility are EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid).
Fertility Benefits
- Hormone regulation: Omega-3s are building blocks for reproductive hormones
- Improved egg quality: Research links omega-3 intake to better ovarian reserve and egg health
- Reduced inflammation: Anti-inflammatory effects may support implantation
- Better blood flow: Supports healthy blood flow to reproductive organs
- Male fertility: DHA is crucial for sperm membrane integrity and motility
Pregnancy Benefits
- Brain development: DHA is the primary structural fat in brain tissue—baby needs it
- Eye development: Critical for retinal development
- Reduced preterm birth risk: Studies show adequate omega-3 intake may reduce early delivery
- Healthy birth weight: Associated with appropriate fetal growth
- Postpartum mood: May support maternal mental health after delivery
During pregnancy, DHA is the star omega-3. Your baby's brain grows dramatically in the third trimester, requiring significant DHA. The American Pregnancy Association recommends at least 200-300mg of DHA daily during pregnancy—many experts suggest even more.
What to Look for in an Omega-3 Supplement
DHA Content
Look for at least 200-300mg DHA per serving. Higher is often better for pregnancy.
Purity Testing
Third-party tested for mercury, PCBs, and other contaminants. Look for IFOS certification.
Source
Small fish (anchovies, sardines) have lower mercury. Wild-caught preferred.
Freshness
Triglyceride form absorbs better. Check for low oxidation levels.
Best Omega-3 Supplements for Fertility & Pregnancy
Nordic Naturals Prenatal DHA
Nordic Naturals is the gold standard in fish oil supplements, and their Prenatal DHA is formulated specifically for pregnancy. Made from 100% wild-caught Arctic cod, it delivers a robust 450mg DHA per serving—well above the minimum recommendation. The triglyceride form ensures excellent absorption, and their proprietary flavoring virtually eliminates fishy burps.
✓ Pros
- Industry-leading purity (IFOS 5-star)
- High DHA content (450mg)
- Triglyceride form for better absorption
- No fishy aftertaste
- Sustainably sourced
- Added vitamin D3
— Cons
- Premium price point
- Requires 2 softgels daily
- Not suitable for fish allergies
Wiley's Finest Wild Alaskan Fish Oil
If you want maximum DHA in the fewest pills, Wiley's Finest is your answer. Their Prenatal DHA delivers an impressive 600mg DHA in a single softgel—one of the highest concentrations available. Sourced from wild Alaskan pollock, it's NSF certified and undergoes rigorous purity testing.
✓ Pros
- Highest DHA per softgel (600mg)
- Only 1 pill needed daily
- NSF certified for purity
- Wild Alaskan sourced
- Good value per mg DHA
— Cons
- Larger softgel size
- Some report slight fishy taste
- Higher upfront cost
Carlson Labs The Very Finest Fish Oil
Carlson has been making award-winning fish oil for over 40 years. While not specifically labeled "prenatal," their Very Finest Fish Oil provides excellent DHA levels and has won multiple taste awards. It's a great option if you're looking for high quality at a more accessible price point.
✓ Pros
- Award-winning taste
- Excellent price per serving
- IFOS 5-star certified
- Norwegian sourced
- Great EPA:DHA balance
— Cons
- Not specifically formulated for pregnancy
- No added vitamin D
- Larger serving size (2 softgels)
Spectrum Essentials Prenatal DHA
A solid budget-friendly option that meets the minimum DHA recommendation. Spectrum uses molecularly distilled fish oil for purity, and the smaller softgel is easier to swallow for those with pill sensitivity. Good entry-level choice if you're watching your supplement budget.
✓ Pros
- Most affordable option
- Small, easy-to-swallow softgel
- Meets minimum DHA requirements
- No fishy aftertaste
— Cons
- Lower DHA than competitors
- Minimal EPA content
- May need additional supplementation
Omega-3 Supplement Comparison
| Product | DHA | EPA | Serving | Price |
|---|---|---|---|---|
| Nordic Naturals Prenatal | 450mg | 75mg | 2 softgels | ~$0.67/day |
| Wiley's Finest | 600mg | 180mg | 1 softgel | ~$0.58/day |
| Carlson Labs | 500mg | 400mg | 2 softgels | ~$0.42/day |
| Spectrum Essentials | 200mg | 20mg | 1 softgel | ~$0.30/day |
How Much Omega-3 Do You Need?
Recommendations vary, but here are general guidelines:
- TTC/Preconception: At least 250mg DHA + EPA combined daily
- During pregnancy: Minimum 200-300mg DHA daily; many experts recommend 500-600mg
- Breastfeeding: Continue 200-300mg DHA daily
Take your omega-3 supplement with a meal that contains some fat—this significantly improves absorption. If you experience any fishy burps, try taking it at the beginning of your meal rather than after, or try a different brand.
Fish Oil vs. Algae-Based Omega-3s
If you're vegetarian, vegan, or have a fish allergy, algae-based DHA supplements are your best option. Algae is actually where fish get their omega-3s in the first place—they accumulate DHA by eating algae.
Algae-based options provide DHA without the fish, though they typically contain little to no EPA. For most pregnancy needs, DHA is the priority, making algae supplements a viable choice.