One study in 480 older adults linked vitamin D deficiency with fatigue symptoms ( 12). Unlike more visible causes like stress, depression, and insomnia, vitamin D deficiency is often overlooked as a potential cause of fatigue. Fatigue and tirednessįeeling tired can stem from a number of causes, one of which may be vitamin D deficiency. However, it is important to note that taking vitamin D supplements - at any dosage - will not prevent COVID-19 ( 2). Recently, vitamin D deficiency has been linked to an increased risk of COVID-19, as well as an increased risk of experiencing severe effects from the condition. Several large observational studies have shown a link between a deficiency and respiratory tract infections such as colds, bronchitis, and pneumonia ( 7, 8).Ī number of studies have found that taking up to 4,000 IU of vitamin D daily may reduce the risk of respiratory tract infections ( 9, 10, 11). If you often become sick, especially with colds or the flu, low vitamin D levels may be a contributing factor. Vitamin D directly interacts with the cells that are responsible for addressing infections ( 6). One of the most important roles of vitamin D is supporting immune health, which helps you ward off viruses and bacteria that cause illness. Keeping that in mind, it’s still helpful to know what signs and symptoms to look for. Sometimes, you may have no symptoms at all. Vitamin D deficiency can be difficult to notice because symptoms may not occur for several months or years. Signs and symptoms of vitamin D deficiency
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