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Sunshine Vitamin: Are You Low on Vitamin D?
April 8, 2026
After a long Minnesota winter, many people are eager to spend more time outdoors. But beyond enjoying the warmer weather, spring also brings attention to something many people may not think about - vitamin D.
Often called the “sunshine vitamin,” vitamin D is produced by the body when skin is exposed to sunlight. During the winter months, especially in northern states, the sun’s rays are not strong enough to support adequate vitamin D production. In fact, Mayo Clinic reports that vitamin D levels can drop 50–60% during winter months in the Northern Hemisphere.
Vitamin D plays an important role in overall health. It helps the body absorb calcium, which is essential for maintaining strong bones, and also supports muscle and immune function. Some research has also linked low vitamin D levels to fatigue and changes in mood.
Because symptoms can be subtle, many people may not realize their levels are low. Signs can include fatigue, muscle weakness, or low mood, though these symptoms can also be related to other conditions.
As daylight increases in the spring, spending time outdoors can help boost vitamin D levels. Even short periods of sun exposure can be beneficial, though it’s still important to balance sun exposure with skin protection.
Diet can also help, though it plays a smaller role than many people expect. The National Institutes of Health reports that only about 10% of vitamin D comes from diet, with most coming from sunlight. Foods such as fatty fish, egg yolks, and fortified products like milk, orange juice, and cereals can help support intake. For some individuals, supplements may be recommended.
Certain groups may be at higher risk for low vitamin D levels, including older adults, individuals with darker skin, and those who spend limited time outdoors.
Vitamin D levels can be checked with a simple blood test. At Mille Lacs Health System, Direct Access Testing (DAT) allows individuals to obtain select lab tests, including vitamin D, without a provider order. This option may be helpful for those without insurance, those visiting the area, or anyone interested in checking certain health markers. Testing is available by appointment Monday through Friday and is paid for at the time of service, as insurance is not billed. There are 16 Direct Access Tests available, ranging from $10 - $75. Common tests include Vitamin D, Hemoglobin A1C, CBC (complete blood count), and TSH (thyroid). To schedule a Direct Access Test at Mille Lacs Health System, call 320-532-3154 and select option 1. You can also learn more about Direct Access Testing on our website, www.mlhealth.org/services/laboratory.
As spring returns, it’s a good reminder that small changes - like getting outside more often or reviewing your diet - can support your overall health.