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Omega-3 / Fish Oil for Pregnancy

Verdict: Published with Warning

Across 5 PubMed studies, the evidence for Omega-3 / Fish Oil in Pregnancy grades Tier B — preliminary evidence. Effective, but with safety or population caveats.

B 🟡 B Preliminary Evidence Published with Warning

🔬Why this grade7-layer evidence engine

⚖️

Scoring transparency

All scores computed by a 7-layer evidence engine — fully auditable
Raw score 0.73
D
C
B
A
S
← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
B · Published with Warning
Confidence
77%
Broadly consistent
Evidence level
E1
Cochrane high-quality SR/MA

How strongly each layer supports this effect

lower = less supportive
L1 ExamineGlobal benchmark
0.50
L2 PubMedPrimary literature
0.75
L3 MechanismPlausibility
0.75
L5 Clinical bodiesAuthoritative stance
0.75
L11 AI re-checkIndependent read
0.80
Against Mixed Supports
▸View the full decision path (audit trail)
  1. compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.73
  2. tier_from_score — 依分數區間映射至 tier letter
  3. apply_hec_rules — 高品質 SR/MA 內部嚴重矛盾 (2 positive vs 2 negative，各 ≥2)
  4. tier_strict_requirement_check — Tier 條件達標，未降階
  5. detect_disputes — 偵測到 1 個 hard + 0 個 soft dispute
  6. decide_status — 依 tier + dispute 結果決定 status

📄PubMed studies (5)L2 · primary research & systematic reviews

Omega-3 fatty acid addition during pregnancy
PMID: 30480773 2018 Cochrane Review n = 19,927
Finding: Across 70 RCTs, omega-3 LCPUFA reduced preterm birth <37 weeks by 11% (13.4% vs 11.9%; RR 0.89, 95% CI 0.81-0.97; 26 RCTs, 10,304 women) and early preterm birth <34 weeks by 42% (4.6% vs 2.7%; RR 0.58, 95% CI 0.44-0.77; 9 RCTs, 5,204 women), both high-certainty evidence, while prolonged gestation >42 weeks probably increased.
🟢 High quality Government Effect size: PTB <37wk RR 0.89 (95% CI 0.81-0.97); early PTB <34wk RR 0.58 (95% CI 0.44-0.77)
View on PubMed
A Randomized Trial of Prenatal n-3 Fatty Acid Supplementation and Preterm Delivery
PMID: 31509674 2019 RCT (double-blind) n = 5,517
Finding: In the largest single trial (ORIP, 800 mg DHA + 100 mg EPA/day), early preterm delivery did not differ between groups overall (2.2% [61/2734] vs 2.0% [55/2752]; adjusted RR 1.13, 95% CI 0.79-1.63, P=0.50); benefit was seen only in a prespecified subgroup of singleton pregnancies with low baseline omega-3 status.
🟢 High quality Government Effect size: Early preterm delivery aRR 1.13 (95% CI 0.79-1.63), P=0.50
View on PubMed
Supplementation of Omega 3 during Pregnancy and the Risk of Preterm Birth: A Systematic Review and Meta-Analysis
PMID: 34069867 2021 統合分析
Finding: Pooling 37 RCTs showed an initial 11% reduction in preterm birth (RR 0.89, 95% CI 0.82-0.97) and 27% reduction in early preterm birth (RR 0.73, 95% CI 0.58-0.92), but both lost statistical significance after sensitivity analysis (PTB RR 0.92, 95% CI 0.83-1.01; ePTB RR 0.82, 95% CI 0.61-1.09), so the authors concluded omega-3 does not reduce preterm birth risk.
Academic Effect size: PTB RR 0.89 (0.82-0.97) main / 0.92 (0.83-1.01) sensitivity; ePTB RR 0.73 (0.58-0.92) main / 0.82 (0.61-1.09) sensitivity
View on PubMed
Omega-3 long chain polyunsaturated fatty acids to prevent preterm birth: a systematic review and meta-analysis
PMID: 25730231 2015 統合分析 n = 3,854
Finding: Across 9 RCTs (3,854 women), omega-3 LCPUFA did not significantly reduce preterm birth <37 weeks (7.7% vs 9.1%; RR 0.90, 95% CI 0.72-1.11), with no overall improvement in neonatal outcomes.
Academic Effect size: PTB <37wk RR 0.90 (95% CI 0.72-1.11), non-significant
View on PubMed
Omega-3 supplementation to prevent recurrent preterm birth: a systematic review and meta-analysis of randomized controlled trials
PMID: 25757636 2015 統合分析 n = 1,080
Finding: Pooling 2 RCTs of women with a previous preterm birth (1,080 women), omega-3 did not significantly prevent recurrent preterm birth <37 weeks (34.5% vs 39.8%; RR 0.81, 95% CI 0.59-1.12), though modest gains in latency and birthweight were noted.
Academic Effect size: Recurrent PTB <37wk RR 0.81 (95% CI 0.59-1.12), non-significant
View on PubMed

🏛️Regulatory & authoritative positionsL4/L5 · FDA / EMA / NIH ODS / Cochrane / Mayo …

L4a US FDA
Supportive
Generally Recognized As Safe (GRAS) - authorized under 21 CFR 184.1472 source↗
L4b EU EFSA
Supportive
intakes of 250mg a day sufficient for normal cardiac function source↗
L4c UK NHS
Neutral
at least 2 portions of fish a week, including 1 of oily fish source↗
L4d TW TFDA / 衛福部
Supportive
每日攝取量所含之ω-3脂肪酸至少應達一．○克 source↗
L4e WHO
Neutral
2 g/day of purified omega-3 fatty acids offer substantial advantages source↗
L5a NIH Office of Dietary Supplements
Supportive
ALA is an essential fatty acid source↗
L5b Mayo Clinic
Supportive
Omega-3s are important for healthy fetal brain and eye development during pregnancy. DHA, in particular, may improve your baby's ability to think and learn. Omega-3s might improve infant health outcomes and lessen the likelihood of preterm birth. During pregnancy, it's recommended to aim for 200 to 300 mg of DHA a day. Many prenatal vitamins also contain DHA. However, if you don't eat fish or o… source↗
L5c Cleveland Clinic
Supportive
You should aim to get at least 200 mg of DHA during pregnancy. Not all prenatals contain DHA, so you may need an additional supplement to get it. source↗
L5d Harvard Health
Cautious
Because omega-3s are important to brain development, and pregnancy depletes omega-3 in expectant mothers, supplementation should theoretically benefit pregnant women and their children. Fish consumption in pregnancy is supported by the FDA, but because we do not have long-term data on safety or optimal dosing of omega-3s in pregnancy, expectant mothers should consider omega-3 supplements judici… source↗
L5e Specialty Society (condition-mapped)
Supportive
During pregnancy you need folic acid, iron, calcium, vitamin D, choline, omega-3 fatty acids, B vitamins, and vitamin C. Eat two or three servings of fish or shellfish per week before getting pregnant, while pregnant, and while breastfeeding. A serving of fish is 4 ounces (oz). Do not eat bigeye tuna, king mackerel, marlin, orange roughy, shark, swordfish, or tilefish. Limit white (albacore) tu… source↗
✓PMID 100% verifiedevery citation checked via NCBI Entrez
🔬5 PubMed studiesindependently re-checked by multiple sub-agents
engine_version: v1.0 claim_id: CLM-COND-pregnancy-INT-omega-3-fatty-acids-001 繁體中文版 →