Omega-3 / Fish Oil for ADHD
Verdict: Insufficient Evidence
Across 5 PubMed studies, the evidence for Omega-3 / Fish Oil in ADHD grades Tier D — counter-evidence. Research is still too limited to draw a firm conclusion.
D 🔴 D Counter-Evidence Insufficient Evidence
Why this grade7-layer evidence engine
⚖️
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditableRaw score 0.32
D
C
B
A
S
← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
D · Insufficient Evidence
Confidence
85%
Highly consistent evidence
Evidence level
E1
Cochrane high-quality SR/MA
▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.318
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 negative 主導 (3 negative > 1 positive)，下層 RCT 不能推翻
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
PubMed studies (5)L2 · primary research & systematic reviews
Polyunsaturated fatty acids (PUFA) for attention deficit hyperactivity disorder (ADHD) in children and adolescents
Finding: High-certainty evidence of no effect on parent-rated total ADHD symptoms (SMD -0.08, 95% CI -0.24 to 0.07; 16 studies, 1166 participants), and high-certainty no effect on inattention (SMD -0.01, 95% CI -0.20 to 0.17) or hyperactivity/impulsivity (SMD 0.09, 95% CI -0.04 to 0.23).
View on PubMed Omega-3 Polyunsaturated Fatty Acids for Core Symptoms of Attention-Deficit/Hyperactivity Disorder: A Meta-Analysis of Randomized Controlled Trials
Finding: No significant effect on overall ADHD core symptoms (SMD -0.16, 95% CI -0.34 to 0.01, p=.07); only a long-duration subgroup (>=4 months) reached significance (SMD -0.35, 95% CI -0.61 to -0.09, p=.007), with neither high EPA dose nor high EPA/DHA ratio improving symptoms.
View on PubMed Efficacy and Safety of Polyunsaturated Fatty Acids Supplementation in the Treatment of Attention Deficit Hyperactivity Disorder (ADHD) in Children and Adolescents: A Systematic Review and Meta-Analysis of Clinical Trials
Finding: Small significant improvement only on parent-rated core symptoms (SMD -0.17, 95% CI -0.32 to -0.02) but no effect on teacher-rated symptoms (SMD -0.06, 95% CI -0.31 to 0.19) or quality of life (SMD 0.01); authors concluded no clear benefit with questionable certainty, and no increase in side effects.
View on PubMed Omega-3 Polyunsaturated Fatty Acids in Youths with Attention Deficit Hyperactivity Disorder: a Systematic Review and Meta-Analysis of Clinical Trials and Biological Studies
Finding: Reported a small-to-moderate improvement in ADHD clinical symptoms (Hedges g=0.38, p<0.0001) and a large effect on the surrogate cognitive/attention measure (g=1.09, p=0.001), with ADHD youth showing lower blood DHA (g=-0.76) and EPA (g=-0.38); this older, smaller analysis is outweighed by later larger meta-analyses.
View on PubMed Are polyunsaturated fatty acids effective for attention-deficit/hyperactivity disorder in children and adolescents? A Cochrane Review summary with commentary
Finding: A commentary restating the Cochrane finding that there is high-certainty evidence PUFA have no effect on total parent-rated ADHD symptoms, only low-certainty evidence of any improvement; it adds no independent effect estimate.
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
Cautious
In healthy school-age children, taking an omega-3 supplement seems to have little effect on cognitive ability and school performance. However, in children who have attention deficit hyperactivity disorder, or ADHD, there appears to be more benefit. Study results appear to indicate that when children with ADHD regularly take an omega-3 supplement, they reduce their symptoms and improve school pe… source↗
L5d Harvard Health
Cautious
The omega-3s have also been proposed to alleviate or prevent other psychiatric conditions including schizophrenia, borderline personality disorder, obsessive compulsive disorder, and attention deficit disorder. source↗
L5e Specialty Society (condition-mapped)
Cautious
Polyunsaturated fatty acid (PUFA) supplementation, such as fish oil, is not an FDA-approved treatment for ADHD. The evidence for its effect on ADHD is mixed. Any benefit from fatty acid supplementation is relatively modest compared to treatment with prescription medication that is FDA-approved for treating ADHD. Additionally, any benefit takes 3 months to accrue. source↗