Chromium for Type 2 Diabetes
The evidence that chromium supplements meaningfully control blood sugar in type 2 diabetes is weak and conflicting. Any effect on glucose markers is small at best, was not reproduced in well-conducted Western trials, and major diabetes authorities do not recommend chromium as a treatment.
Why this grade7-layer evidence engine
The trial record is inconsistent. An early Chinese study (PMID 9356027) reported a striking HbA1c drop of about 1.9% on high-dose chromium, but this result is an outlier most likely tied to baseline deficiency and was never reproduced. In a Western randomized trial of chromium yeast, there was no effect on HbA1c at all (PMID 17303791).
Meta-analyses temper the picture further. A 2014 review of 25 trials (PMID 24635480) found only a modest, highly heterogeneous HbA1c reduction of roughly 0.55%, driven mainly by chromium picolinate above 200 mcg/day. A 2015 meta-analysis (PMID 25971249) found no significant HbA1c benefit for any form and only a minor fasting-glucose effect for brewer's yeast, and an NIH systematic review (PMID 27261273) concluded just 3 of 14 trials hit a clinically meaningful target. All outcomes are surrogate markers, with no data on complications or mortality.
Regulators and clinics largely agree. The FDA calls any link 'highly uncertain' and the EU's EFSA found 'no evidence of beneficial effects,' while NIH ODS judges chromium's effects to be of 'little clinical significance' and Cleveland Clinic advises caution given drug interactions and scant upside. The American Diabetes Association states there is insufficient evidence to support routine chromium use. Hence a weak, disputed grade: chromium is not a reliable treatment and should not replace standard diabetes care.
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 = 0.427
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (1 篇 > 0 negative)
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 1 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status