Iron for Iron Deficiency Anemia
For people with confirmed iron deficiency anemia, oral iron is a well-established, first-line treatment that reliably restores hemoglobin and replenishes iron stores. The benefit, however, applies specifically to those who are genuinely deficient, not to the general population.
Why this grade7-layer evidence engine
This earns a Strong (S) grade because clinical guidance, regulators, and trials all point the same way. The American Society of Hematology calls oral iron "the first-line therapy for most patients with iron deficiency anemia," and major clinics agree: Cleveland Clinic states most IDA patients need supplements, Harvard Health notes red-cell production rises within three to ten days, and Mayo Clinic adds that vitamin C aids absorption. NIH ODS confirms iron is an essential component of hemoglobin.
Regulators reinforce this. The US FDA classifies iron salts as a nutrient supplement, EFSA recognizes that iron "contributes to normal oxygen transport in the body," and the WHO recommends daily oral iron with folic acid in pregnancy. Supporting trials are consistent: an RCT (PMID 32610864, n=100) showed meaningful hemoglobin and ferritin gains, while Stoffel 2020 (PMID 31413088) found alternate-day dosing raises absorption 40-50% by avoiding hepcidin spikes.
Nuance keeps this from being unqualified. The UK NHS cautiously notes most people get enough iron from diet, so supplements help only those truly deficient; oral iron commonly causes GI upset. The strongest sub-findings are modest: the ferrous-bisglycinate meta-analysis (PMID 36728680) improved hemoglobin in pregnancy (SMD 0.54) but was rated very low certainty, and the IV-versus-oral pregnancy trial (PMID 34839481) was a small pilot (n=23).
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 = 0.73
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 無高階證據可裁決
- tier_strict_requirement_check — A 級條件達標
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status