維生素 K Vitamin K × 骨折
結論：主流反證據
高階證據明確顯示無效或有害 — 發布為「反證據型」內容（L11 grade=D）
D 🔴 D 反證據 主流反證據 ⚠️ medium — moderate promotional content
⚖️
評分透明度
所有分數由 7 層證據引擎計算，過程公開可查原始分數 0.30
D
C
B
A
S
← 反證據 / 無效有效 / 強證據 →
最終評級
D · 主流反證據
信心度
84%
證據方向一致性高
證據層級
E2
多篇高品質統合分析（≥2 篇一致）
▸查看完整決策路徑（audit trail）
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.302
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (2 篇 > 0 negative)
- 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
Effect of vitamin K on bone mineral density and fractures in adults: an updated SR and MA of RCTs
結論：Any clinical fracture OR 0.72 (95% CI 0.55-0.95); attenuates to OR 0.76 (0.58-1.01) in low-risk-of-bias subset (NS). No effect on vertebral fractures (OR 0.96, 0.83-1.11). Authors conclude evidence insufficient to confirm fracture benefit.
前往 PubMed
Vitamin K supplementation in postmenopausal women with osteopenia (ECKO trial): a RCT
結論：No effect on BMD at lumbar spine or hip vs placebo. Fewer clinical fractures in K1 arm (9 vs 20, p=0.04) and fewer cancers (3 vs 12, p=0.02), but trial was not powered for these endpoints; secondary findings considered hypothesis-generating.
前往 PubMed
Vitamin K and the prevention of fractures: SR and MA of RCTs
結論：MK-4 strongly associated with fracture reduction: vertebral OR 0.40, hip OR 0.23, all nonvertebral OR 0.19. Authors note effect was concentrated in Japanese MK-4 trials at 45 mg/day; later flagged with 2018 erratum for methodological concerns in included trials.
前往 PubMed
Does vitamin K2 play a role in the prevention and treatment of osteoporosis for postmenopausal women: a MA of RCTs
結論：K2 reduced fracture incidence in postmenopausal osteoporotic women, particularly after sensitivity analysis removing high-heterogeneity trials. Effect driven primarily by Japanese high-dose MK-4 trials; generalizability to non-Japanese populations and to lower-dose MK-7 not established.
前往 PubMed
L4a US FDA
支持
Vitamin K1 Injection is indicated for prophylaxis and treatment of vitamin K-deficiency bleeding in neonates 來源↗
L4b EU EFSA
支持
a cause and effect relationship has been established between the dietary intake of vitamin K and normal blood coagulation ... and the maintenance of normal bone 來源↗
L4c UK NHS
謹慎
You should be able to get all the vitamin K you need by eating a varied and balanced diet. Any vitamin K your body does not need immediately is stored in the liver for future use, so you do not need it in your diet every day. 來源↗
L4d TW TFDA / 衛福部
支持
成年男性 120 微克／日，女性 90 微克／日（足夠攝取量 AI） 來源↗
L4e WHO
支持
vitamin K1 should be given to all newborns as a single, intramuscular dose of 0.5–1 mg 來源↗
L5a NIH Office of Dietary Supplements
支持
Vitamin K, the generic name for a family of compounds with a common chemical structure of 2-methyl-1,4-naphthoquinone, is a fat-soluble vitamin 來源↗
L5b Mayo Clinic
謹慎
Some studies, many conducted in Japan, found that supplementation with vitamin K1 or vitamin K2 improved bone mineral density, and few studies showed a decreased risk of bone fractures. However, some subsequent studies found that vitamin K supplementation had no effect on bone mineral density. 來源↗
L5c Cleveland Clinic
謹慎
Some studies indicate that a higher daily intake of vitamin K reduces the risk of bone fractures and low bone density (osteopenia). A lot of other factors can affect bone health, including a lack of calcium and vitamin D. We need more rigorous studies to establish the link before we can confidently recommend vitamin K supplements. 來源↗
L5d Harvard Health
謹慎
the results of clinical trials and meta-analyses have been conflicting whether vitamin K supplements reduce bone fractures. 來源↗
L5e Specialty Society (condition-mapped)
未表態
Necessary for bone formation and mineralization, Vitamin K also is important for blood clotting, and it may assist in channeling calcium directly to the bone rather than the blood vessels. 來源↗
PTT · Dcard · Mobile01 彙整自公開論壇討論，非統計抽樣，僅反映社群風向。
廣告 / 業配密度 中度
低中高
📍立場總覽
社群幾乎無人把維生素K單獨用於骨折，只在補鈣討論中當成鈣片附帶成分（D3+K2+鎂），少數質疑K2證據薄弱。
💬社群實感
無共識（無人將維生素K單獨用於骨折，僅作為補鈣配方附帶成分被動提及）
破解迷思 社群最常見的 3 個誤解
✓
事實把含 K2 的鈣片當成「加速骨折癒合」產品（社群其實只討論補鈣，骨折癒合靠蛋白質與鈣，K2 角色被誇大）
✓
事實誤以為 K2(MK-7) 與 K2(MK-4) 可互相取代、效果相同
✓
事實認為鈣片有加 K2 就一定吸收更好、骨折好更快（屬行銷帶動的認知）
🏷️ 社群熱議品牌
依論壇被提及頻率，非銷售或品質排序。
- Vitabox 維他盒子（納豆發酵維生素 K2）
- 挺立
- WEIDER 威德
⚠️ 列出僅代表「TW 社群討論度高」，不代表本站推薦或背書。本站不販售任何產品、無導購連結。
- 負重與肌力訓練運動
- 抗骨流失藥物（雙磷酸鹽等）
- 跌倒風險評估與預防
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