Lactoferrin for Iron Absorption
Oral lactoferrin appears to match or modestly beat ferrous sulfate at raising iron status with fewer gut side effects, but the evidence comes from small, mostly single-center trials and no major clinical body endorses it, so it rates only preliminary (Tier B) support.
Why this grade7-layer evidence engine
The clinical literature is consistently positive. Four meta-analyses and systematic reviews covering more than 4,800 people found oral bovine lactoferrin equaled or outperformed ferrous sulfate: a 19-trial pooled analysis favored lactoferrin for hemoglobin (PMID 38291525), an 11-trial analysis showed higher serum iron and ferritin (PMID 35276902), a pregnancy meta-analysis raised hemoglobin by about 0.77 g/dL (PMID 29059584), and a pediatric review reached the same conclusion (PMID 37661669). All reported fewer gastrointestinal side effects.
The grade stays at preliminary because the body of work is thin where it counts. The trials are mostly small and single-center, several come from research groups with potential dairy-industry ties, and the only direct iron-absorption study (a stable-isotope crossover in 25 infants) showed the benefit depends on form: iron-unsaturated apo-lactoferrin raised fractional absorption, while iron-saturated holo-lactoferrin behaved like ferrous sulfate. Most retail products do not disclose which form they contain.
Institutions are notably silent. The US FDA has issued GRAS no-questions letters and EFSA cleared bovine lactoferrin as a novel food, but both rulings concern food-ingredient safety, not any authorized iron-absorption or anti-anemia health claim; the NHS and WHO take no position. No major clinic (Mayo, Cleveland Clinic, Harvard, NIH ODS) mentions lactoferrin for iron, and gastroenterology guidance still names ferrous sulfate the preferred oral iron. That gap between encouraging trials and unconvinced clinical bodies is exactly what a Tier B verdict reflects.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸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 = 0.657
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (3 篇 > 0 negative)
- 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