Binciken shekaru biyu, gwaji double‑blind da aka yi a kan mutane 400 masu matuƙar calcium a jijiyoyin coronary, ya nuna cewa haɗin babban ƙima na vitamin K2 da D3 yana rage ci gaban kwatancen hanyoyin jini da kusan 21 % idan aka kwatanta da placebo (196 AU vs 248 AU). Hoto na plaque bai nuna ƙaruwa a plaque marar calcium ba, alamar da ke ba da kwanciyar hankali. Kodayake maganin ya rage ci gaba, ba ya dawo da calcium da aka riga aka tara, kuma binciken bai auna yawan bugun zuciya ko mutuwar masu shiga ba. Mahalarta sun kasance manya (tsaka‑tsakin shekaru 71) da suka riga suka samu cutar coronary mai tsanani, don haka sakamakon na iya rashin dacewa ga wasu ƙungiyoyin mutane.
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