Vitamin D3 is the active form of vitamin D produced by sun exposure or obtained from animal products.
Vitamin D3, also known as cholecalciferol, is a fat-soluble vitamin synthesized in the skin upon sun exposure and obtained from animal sources. It is the most bioavailable form of vitamin D for human health.
Vitamin D3 is synthesized endogenously when 7-dehydrocholesterol in the skin is exposed to UVB radiation, or it can be obtained directly from animal-derived foods and supplements. Once ingested or synthesized, vitamin D3 undergoes hydroxylation in the liver and kidneys to form the active metabolite calcitriol, which regulates calcium and phosphorus homeostasis. This vitamin plays crucial roles beyond bone health, including immune function, cellular differentiation, and cardiovascular regulation. Most people require 10-20 minutes of midday sun exposure several times per week, though this varies by latitude, season, skin tone, and age.
Vitamin D3 regulates calcium absorption, bone mineralization, immune function, and cellular differentiation throughout the body.
Aim for 10-30 minutes of midday sun exposure 3-4 times per week when possible, and include vitamin D3-rich foods in your diet regularly. If sun exposure is limited due to geography, season, or lifestyle, consider supplementation with vitamin D3 (1000-2000 IU daily for adults), especially during winter months.
Vitamin D3 is essential for bone health, immune function, and overall wellness, and can be obtained through sun exposure, animal-based foods, and supplements.
A question about Vitamin D3? Ask our nutrition AI.
Ask a question