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“Conversely, people whose magnesium levels are sufficiently high require less vitamin D supplementation to achieve healthy levels. The recommended dietary allowance for magnesium for adults between the ages of 31 and 50 years is 420 milligrams for men and 320 milligrams for women per day.”

“Evidence suggests that people with vitamin D deficiency are at greater risk of viral infection and autoimmune disorders. This is in keeping with the widely held belief that a principal role of vitamin D is to restrain, or balance, immune system activity.”

“However, people with higher baseline vitamin D levels also benefited, although the effect was more modest (10 per cent risk reduction). Overall, the reduction in risk of acute respiratory infection induced by vitamin D was on a par with the protective effect of injectable 'flu vaccine against 'flu-like illnesses.”

“Half of the participants received 500 milligrams of vitamin C twice daily for four weeks; the other half received a placebo. They assessed the participants' fatigue, attention, anxiety, and other aspects of work performance and mental health status.”

“Vitamin D plays critical roles in many physiological processes, such as calcium balance, blood pressure regulation, immune function, and cell growth. Poor vitamin D status is implicated in the pathogenesis of many acute and chronic diseases, including rickets, osteoporosis, multiple sclerosis, and cancer.”

“However, evidence suggests that nutritional factors influence the risk of vascular calcification. A recent meta-analysis found that vitamin K reduces the risk of vascular calcification, especially in the coronary arteries.”

“Supplemental vitamin D intake, body mass index, and race/ethnicity had the greatest influence on vitamin D concentrations, and genetic variants had only a minor influence. Black women had the lowest vitamin D concentrations among the cohort, possibly contributing to their poorer outcomes following breast cancer diagnosis.”

“From the article: > Patients administered vitamin C had a rapid and statistically and clinically significant improvement in mood state, but no significant change in mood occurred with vitamin D, the researchers discovered. [...] About one in five acute-care patients in our hospital have vitamin C levels so low as to be compatible with scurvy," added Hoffer.”

“The body has limited vitamin K storage capacity, so the body recycles it in a vitamin K redox cycle and reuses it multiple times. Naturally occurring forms of vitamin K include phylloquinone (vitamin K1) and a family of molecules called menaquinones (vitamin K2).”

“Young children who received supplemental vitamin D were less likely to have neurobehavioral problems later in childhood than those who didn't. Researchers gave 346 infants either low-dose (400 IU) or high-dose (1,200 IU) vitamin D daily from two weeks to two years of age.”