鐵 Iron × ADHD
結論：證據支持但有警示
鐵×ADHD 證據呈現「條件式 cautious」格局：2024 Elliott SR/MA（3 RCT, n=124）顯示補鐵組過動效應量大 (d=1.
C 🟠 C 薄弱證據 附警語發布 ⚠️ medium — moderate promotional content
鐵×ADHD 證據呈現「條件式 cautious」格局：2024 Elliott SR/MA（3 RCT, n=124）顯示補鐵組過動效應量大 (d=1.70) 但組間差異未達統計顯著，整體 GRADE 評為 very low；2025 Fiani MA (n=1408) 在非貧血族群顯示鐵可改善焦慮、疲勞、認知 (d=0.34-0.46) 但未改善注意力。
CHADD 與 Mayo 均明確表態「僅對確認缺鐵者補充，不可作為 ADHD 主治療」，Cleveland 與 Harvard 對此題未表態。
鐵本身有兒童過量致死風險（FDA 強制警語）。
整體不足以給 B 但有正面條件式訊號，給 C。
⚖️
評分透明度
所有分數由 7 層證據引擎計算，過程公開可查原始分數 0.46
D
C
B
A
S
← 反證據 / 無效有效 / 強證據 →
最終評級
C · 附警語發布
信心度
82%
證據方向一致性高
證據層級
E3
單篇高品質統合分析
▸查看完整決策路徑（audit trail）
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.464
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高階證據未達主導 (0 positive vs 1 negative)，由 raw_score 決定
- 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
Iron Supplementation in Management of Neurodevelopmental Disorders: Systematic Review, Meta-Analysis, and Qualitative Synthesis
結論：In the hyperactivity meta-analysis (3 RCTs, n=124) the iron group had a large within-group effect (Cohen's d=1.70) vs placebo (d=0.76), and in inattention (2 RCTs, n=75) iron d=3.19 vs placebo d=1.66, but the BETWEEN-GROUP differences were NOT statistically significant and the evidence was graded very low quality.
前往 PubMed Psychiatric and cognitive outcomes of iron supplementation in non-anemic children, adolescents, and menstruating adults: A meta-analysis and systematic review
結論：Pooled RCT data (18 studies incl. 12 RCTs, n=1408) showed iron improved anxiety (d=0.34), fatigue (d=0.34), cognition/intelligence (d=0.46) and short-term memory (d=0.53), but had NO significant effect on attention and no significant effect on depression in RCTs.
前往 PubMed Effects of iron supplementation on attention deficit hyperactivity disorder in children
結論：Ferrous sulfate 80 mg/day for 12 weeks produced a significant within-group ADHD Rating Scale decrease (-11.0 +/- 13.9, P<0.008) vs no change on placebo (3.0 +/- 5.7, P=0.308) and lowered CGI-Severity (P<0.01), but Conners parent (P=0.055) and teacher (P=0.076) scales did not reach significance and the trial was very small with a 3:1 randomization (iron n=18, placebo n=5).
前往 PubMed Effects of Iron Supplementation on Attention Deficit Hyperactivity Disorder in Children Treated with Methylphenidate
結論：Adding ferrous sulfate to methylphenidate for 12 weeks (n=50) improved the conduct subscale within the iron group (P=0.003) and some subscales at specific timepoints (learning problems wk1-6 P=0.007; conduct/psychosomatic wk7-12), but there was NO significant overall between-group difference in score changes between iron and placebo.
前往 PubMed Iron Status in Attention-Deficit/Hyperactivity Disorder: A Systematic Review and Meta-Analysis
結論：Across 10 studies (n=2191, 1196 ADHD) serum ferritin was significantly lower in ADHD (SMD=-0.40, 95% CI -0.66 to -0.14), whereas serum iron did NOT differ (SMD=-0.026, 95% CI -0.29 to 0.24); this shows a correlation between low iron stores and ADHD, not that supplementation treats ADHD.
前往 PubMed Iron and attention deficit/hyperactivity disorder: What is the empirical evidence so far? A systematic review of the literature
結論：Of ~20 studies assessing peripheral iron status the results were MIXED (both significant and non-significant ferritin-ADHD associations); only two small supplementation trials (one open-label, one pilot RCT) showed improvement in some but not all ADHD measures, and iron deficiency may reduce psychostimulant effectiveness.
前往 PubMed L4a US FDA
支持
NUTRIENT SUPPLEMENT 來源↗
L4b EU EFSA
支持
contributes to normal oxygen transport in the body 來源↗
L4c UK NHS
謹慎
You should be able to get all the iron you need from your daily diet. 來源↗
L4d TW TFDA / 衛福部
支持
育齡婦女及懷孕婦女每日建議攝取鐵量為15毫克，至懷孕第3期婦女則應增加每日攝取量至45毫克。 來源↗
L4e WHO
支持
Daily oral iron and folic acid supplementation is recommended as part of antenatal care 來源↗
L5a NIH Office of Dietary Supplements
支持
Iron is an essential component of hemoglobin 來源↗
L5b Mayo Clinic
謹慎
Some promising research studies indicate that iron supplements likely help people manage ADHD if they have deficiencies in iron. 來源↗
L5c Cleveland Clinic
中性
— 本適應症無對應資料
L5d Harvard Health
中性
— 本適應症無對應資料
L5e Specialty Society (condition-mapped)
謹慎
Frequently, the elements zinc, magnesium, and iron are studied in relationship to ADHD. One should treat a deficiency but not depend on these substances to correct ADHD. These elements shouldn't be taken in large doses or by people who don't have a deficiency, as that could lead to other health problems. 來源↗
PTT · Dcard · Mobile01 彙整自公開論壇討論，非統計抽樣，僅反映社群風向。
廣告 / 業配密度 中度
低中高
📍立場總覽
TW 社群（PTT Child_Psy、BabyHome、Dcard 心理板）普遍認知「鐵是多巴胺合成的輔助因子」，過動兒若血清鐵蛋白偏低可能加重注意力與衝動症狀，多數家長分享傾向先驗血再補鐵，並強調這只是輔助、不能取代正規藥物治療。
💬社群實感
意見分歧
破解迷思 社群最常見的 5 個誤解
✓
事實以為補鐵就能取代 ADHD 藥物（利他能、專思達）
✓
事實把『過動兒一定缺鐵』當成定論，忽略需先驗血確認
✓
事實誤認鐵劑越多越好，忽略過量會便祕、噁心甚至中毒
✓
事實把『鐵蛋白低』直接等同於『缺鐵性貧血』，但兩者判讀不同
✓
事實認為吃保健食品（綜合維他命含微量鐵）就足以矯正缺鐵
🩹 社群通報的副作用
- 便祕
- 噁心、胃部不適
- 黑便
- 鐵腥味造成兒童拒服
- 與鋅、鈣同服影響吸收
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