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Bone and Immune HealthVitamin SupplementSupports Bone Health Plus Immune and Cardiovascular WellnessPromotes Calcium Absorption in the BodyScience-Backed Quality Since 1969Do you get enough of the powerhouse Sunshine Vitamin? The body manufactures some vitamin D on its own when it is exposed to sunlight—hence the nickname—but for people living in the northern latitudes where wintertime sun exposure is limited the body's natural vitamin D production may not be enough. Additionally our ability to produce vitamin D diminishes with age. According to the National Institutes of Health most people in the United States consume less than recommended amounts of vitamin D.