Benefits/Characteristics Vitamins D and K are oil-soluble and play an important role in maintaining the body in good condition. Vitamin D is produced by the photolytic action of ultraviolet radiation in the skin. Despite the fact that each organism can produce vitamin D, the modern lifestyle and insufficient exposure to sunlight, results in the intake of vitamin D, which must necessarily be obtained through food. Vitamin K is an important cofactor in a large number of biochemical reactions and is mainly found in green leafy vegetables and fermented dairy products. Vitamin D contributes to: the normal absorption/utilization of calcium and phosphorus. the maintenance of normal calcium levels in the blood. the maintenance of the normal state of bones and teeth. the maintenance of normal muscle function. the normal function of the immune system. the