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Vitamin K is a family of structurally similar, fat-soluble vitamers found in foods and marketed as dietary supplements. [1] The human body requires vitamin K for post-synthesis modification of certain proteins that are required for blood coagulation ("K" from Danish koagulation, for "coagulation") or for controlling binding of calcium in bones and other tissues. [2]
Vitamin K 1-deficiency may occur by disturbed intestinal uptake (such as would occur in a bile duct obstruction), by therapeutic or accidental intake of a vitamin K 1-antagonist such as warfarin, or, very rarely, by nutritional vitamin K 1 deficiency. As a result, Gla-residues are inadequately formed and the Gla-proteins are insufficiently active.
Newborn infants are a special case. Plasma vitamin K is low at birth, even if the mother is supplemented during pregnancy, because the vitamin is not transported across the placenta. Vitamin K deficiency bleeding (VKDB) due to physiologically low vitamin K plasma concentrations is a serious risk for premature and term newborn and young infants.
How much vitamin D do I need? Older adults need about 600 – 800 IU of vitamin D daily, depending on their age. ... Rickets (in children) ... The best laundry detergent sheets of 2025. AOL.
The CDC collects and publishes health information for travelers in a comprehensive book, CDC Health Information for International Travel, which is commonly known as the "yellow book." [ 79 ] The book is available online and in print as a new edition every other year and includes current travel health guidelines, vaccine recommendations, and ...
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But new research shows that it may have other protective benefits for older adults. A recent study published in the British Medical Journal, looked at a large sample of older adults ages 60 to 84 ...
Vitamin A deficiency affects one third of children under age 5 around the world, [33] leading to 670,000 deaths and 250,000–500,000 cases of blindness. [34] Vitamin A supplementation has been shown to reduce all-cause mortality by 12 to 24%. [35]