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Vitamin K has been widely promoted as a supplement for decreasing bone loss in postmenopausal women, but the long-term benefits and potential harms are unknown. This study was conducted to determine whether daily high-dose vitamin K1 supplementation safely reduces bone loss, bone turnover, and fractures.

http://www.plosmedicine.org/article/info%3Adoi%2F10.1371%2Fjournal.pmed.0050196