vitamin k traffic sign on blue sky

vitamin blood clotting deficiency benefits sources leafy greens bone health coagulation foods supplements rich absorption function metabolism intake daily requirement recommended allowance rda babies newborns nutrition osteoporosis heart density vessels arteries thinners warfarin anticoagulants medication interactions dietary guidelines nutritional value green vegetables kale spinach broccoli brussels sprouts collard swiss chard cabbage lettuce turnip asparagus parsley celery dill scallions traffic sign blue sky