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