They are vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). Vitamin D supplements can be taken with or without food and the full amount can be taken at one time. While your body needs vitamin D to absorb calcium, you do not need to take vitamin D at the same time as a calcium supplement.
Just so, how vitamin D is absorbed?
But vitamin D is also produced by the body in a complex process that starts when rays in the invisible ultraviolet B (UVB) part of the light spectrum are absorbed by the skin. The liver, and then the kidneys, are involved in the steps that eventually result in a bioavailable form of the vitamin that the body can use.
What affects vitamin D absorption?
The vitamin D that is consumed in food or as a supplement is absorbed in the part of the small intestine immediately downstream from the stomach. Therefore, conditions that affect the gut and digestion, like celiac disease, chronic pancreatitis, Crohn's disease, and cystic fibrosis, can reduce vitamin D absorption.
Which foods are high in vitamin D?
Foods that provide vitamin D include:
- Fatty fish, like tuna, mackerel, and salmon.
- Foods fortified with vitamin D, like some dairy products, orange juice, soy milk, and cereals.
- Beef liver.
- Egg yolks.