What is the most bioavailable form of vitamin D?
In our study, the microencapsulated form of vitamin D was the most bioavailable.
What makes vitamin D absorb better?
Avocados, nuts, seeds, full-fat dairy products and eggs are nutritious sources of fat that help boost your vitamin D absorption. Studies indicate that having vitamin D with a large meal or source of fat can significantly increase absorption.
Is vitamin D2 bioavailable?
The main conclusions are: (i) ergocalciferol (vitamin D2), the form mostly used in supplements and fortified foods, is apparently absorbed with similar efficiency to cholecalciferol (vitamin D3, the main dietary form), (ii) 25-hydroxyvitamin D (25OHD), the metabolite produced in the liver, and which can be found in …
What factors influence vitamin D absorption?
These factors include variations in the physiochemical state of the vitamin D (molecular forms, potency and their physiological linkages), the complexity of food matrix (the amount and type of fatty acids, dietary fibers and presence/absence of vitamin D enhancer and inhibitor), and its interaction of other fat soluble …
What is the bioavailability of vitamin D 2?
We therefore conducted a bioavailability study in healthy volunteers who received a placebo—50 μg/d of vitamin D 2 or 50 μg/d of vitamin D 3 (2000 IU/d). The aim was to investigate the effects of this high dose on the serum levels of the hydroxylated forms 25 (OH)D 2 and 25 (OH)D 3 and on their sum total 25 (OH)D.
Where does vitamin D 2 and D 3 absorption occur?
In foods and dietary supplements, vitamin D has two main forms, D 2 (ergocalciferol) and D 3 (cholecalciferol), that differ chemically only in their side-chain structures. Both forms are well absorbed in the small intestine. Absorption occurs by simple passive diffusion and by a mechanism that involves intestinal membrane carrier proteins [ 4 ].
Where can I find reference values for vitamin D?
Intake reference values for vitamin D and other nutrients are provided in the Dietary Reference Intakes (DRIs) developed by the Food and Nutrition Board (FNB) at the Institute of Medicine of The National Academies (formerly National Academy of Sciences) [ 1 ].
What are the factors that affect vitamin D synthesis?
Season, time of day, length of day, cloud cover, smog, skin melanin content, and sunscreen are among the factors that affect UV radiation exposure and vitamin D synthesis [ 1 ]. Perhaps surprisingly, geographic latitude does not consistently predict average serum 25 (OH)D levels in a population.
