Legacy AI grade · Sources dated 2026-06-01. Not expert reviewed. Coverage is limited to the listed sources. About the new summary workflow
Copper for Osteoporosis
There is not enough evidence to show that copper supplements prevent or treat osteoporosis. Copper is an essential trace mineral, but no human trial has isolated a bone benefit from copper taken on its own.
Why this grade7-layer evidence engine
Only two small randomized trials exist, and neither establishes a copper-specific effect on bone. In a 2-year trial of postmenopausal women (PMID 8027856, n=59), the arm taking calcium plus a copper-manganese-zinc blend gained spinal bone density (+1.48%) versus loss on placebo (-3.53%), but copper was given as part of a combination supplement, so its individual contribution cannot be separated; the trace-minerals-only arm still lost bone. That study was also industry-funded.
The only copper-alone trial (PMID 10655977, n=24, 6 weeks) found no effect on any bone-turnover marker, and it measured short-term biochemistry rather than bone density or fractures. With fewer than three studies and none isolating copper for a hard osteoporosis endpoint, the evidence base is too thin and too confounded to support a verdict.
Regulators and clinics back this caution. The NHS says a varied diet supplies all the copper you need, and the FDA sets a daily value (0.9 mg) without any bone-health claim. EFSA permits only a general 'maintenance of normal connective tissues' statement, which reflects copper's role as a cofactor for collagen cross-linking, not an osteoporosis treatment. Major bodies (NIH ODS, Mayo, Harvard, BHOF/AACE) do not list copper as a bone therapy. The mechanism is plausible, but a plausible mechanism is not proof of benefit.
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 = 0.387
- 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 — D 級條件未達 (需 E1-E3 negative；實際 E6)
- detect_disputes — 偵測到 0 個 hard + 1 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status