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Vitamin D is a fat-soluble essential vitamin synthesized in the skin when exposed to direct sunlight. Vitamin D plays a key role in many bodily processes, including mood, immune system health, and bone health. While those who receive a lot of sun exposure likely don't need vitamin D supplements, those who work indoors or don't spend much time outdoors may be deficient in vitamin D and may benefit from supplementation. Vitamin K is another essential fat-soluble vitamin that supports cardiovascular and bone health. Vitamin K2 should always be supplemented with vitamin D3, as high doses of D3 alone can cause short-term hypercalcemia in some people.
03.09.2026
