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What Ingredients Are in Vitamin D3?

What Ingredients Are in Vitamin D3?
Vitamin D3's ingredients are synthesized through the skin by the sun's rays. Photo Credit: Photodisc/Photodisc/Getty Images

Vitamin D3 is a fat-soluble vitamin made in the skin. It plays a major part in bone-density levels and can help the immune system fight disorders such as cancer and diabetes. It also helps the body better absorb other nutrients, such as calcium. The sun is the primary source of vitamin D3, but individuals who avoid sun exposure may require vitamin D3 supplements. Consult a health-care specialist before starting dietary or herbal supplements as treatment options.

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Vitamin D3, also known as cholecalciferol, can be synthesized through the skin from the sun's ultraviolet rays. It helps promote strong bones by aiding the body in calcium absorption. Once cholecalciferol enters the skin, it is then transformed into calcitriol by the kidneys. Calcitriol is what aids in the absorption of both phosphorus and calcium. According to the National Cancer Institute, vitamin D3 deficiency can cause thin, frail bones or a disorder known as rickets, especially in young children. Vitamin D3 helps boosts the immune system and can help increase muscle strength as humans grow older.

Maltrin and Gelatin

Maltrin, also known as maltodextrin, is a carbohydrate that is easy to digest. It is made from cornstarch and comes in powder form. It is most commonly added to nutritional products because it provides a source of energy. It is also cold-water soluble. According, a study conducted by the Center for Chemistry and Chemical Engineering states that maltrin is a key ingredient in the production of both food and vitamin supplements. Gelatin is a tasteless and easily digested compound that is produced using collagen in animal bones and skin. In vitamin D3, gelatin is used to create the capsules for the other ingredients of the vitamin because it can store powder substances.

Colloidal Silicon Dioxide and Magnesium Stearate

Colloidal silicone dioxide is primarily used as a thickening agent. It is an inactive ingredient in vitamin D3 capsules. It is also considered a diluent. Magnesium stearate is a common additive in most supplements because it has a lubricating effect. According to, a 1999 study performed by Groningen Institute For Drug Studies, states that magnesium stearate may have little to no significance on tablet relaxation. It does not interfere with other bonding agents used in tablets.

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