Copper for Micronutrient Deficiency
For people with documented copper deficiency, copper repletion reliably reverses the blood-related abnormalities (anemia and low neutrophils), making it standard clinical care; the nerve damage it can cause is often only partly reversible, and healthy adults eating a balanced diet do not need to supplement.
Why this grade7-layer evidence engine
This earns a moderate grade because the evidence is consistent but built almost entirely on retrospective case series and a case-report systematic review rather than randomized trials. A case report (PMID 33448718) and the broader case-series literature describe severe anemia and near-universal neutropenia resolving within weeks of copper repletion, while a national review of 16 patients (PMID 23034053) reported cytopenia resolution in 93%. Smaller series (PMID 18284630, PMID 15834043) confirm the same prompt hematologic recovery.
The grade is held back from the top tier by a clear limitation: the neurologic damage (myeloneuropathy) responds poorly. In the same 16-patient review only 25% improved neurologically and 33% worsened, and case series conclude the myelopathy may be irreversible, making early diagnosis the decisive factor. For inherited Menkes disease, copper-histidine helps only if started within roughly four weeks of birth (PMID 8229500); a delayed-treatment cohort saw 58% die before age five (PMID 24919650).
Regulators (FDA, EFSA, WHO) treat copper purely as an essential nutrient with no disease-treatment claims, and the UK NHS notes a varied diet supplies all the copper most people need. The clinical case is narrow and well-supported: post-bariatric reviews show routine multivitamin-mineral supplements keep copper deficiency to low single-digit rates (about 0-5%) (PMID 27034062, PMID 25271186, PMID 41353140). The strongest practical message is to watch for high-dose zinc, an often-overlooked, preventable cause of copper deficiency.
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 = 0.727
- 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 — 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