D3vitamiinin

D3vitamiinin, also known as cholecalciferol, is a fat-soluble vitamin essential for human health. It plays a crucial role in calcium and phosphorus absorption, which are vital for maintaining strong bones and teeth. D3vitamiinin also supports immune function and may have roles in regulating cell growth and reducing inflammation.

The primary source of D3vitamiinin for most people is exposure to sunlight. When ultraviolet B (UVB) rays from the sun hit the skin, a chemical reaction converts a precursor molecule into D3vitamiinin. Dietary sources include fatty fish like salmon, mackerel, and tuna, as well as fortified foods such as milk, orange juice, and cereals.

A deficiency in D3vitamiinin can lead to rickets in children, a condition characterized by soft and deformed bones, and osteomalacia in adults, which causes bone pain and weakness. Severe deficiency can also contribute to osteoporosis, an increased risk of fractures. Factors that can increase the risk of deficiency include limited sun exposure, darker skin pigmentation, older age, obesity, and certain medical conditions affecting fat absorption.

To ensure adequate levels, supplementation with D3vitamiinin is often recommended, especially for individuals with limited sun exposure or dietary intake. It is important to consult a healthcare professional to determine the appropriate dosage. D3vitamiinin is stored in the body's fat tissues and liver.