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Vitamin D is produced in the keratinocytes of two innermost strata of the epidermis, the stratum basale and stratum spinosum, which also are able to produce calcitriol and express the vitamin D receptor. [171] Vitamin D 3 is produced photochemically from 7-dehydrocholesterol in the skin of most vertebrate animals, including humans. [172]
Vitamin D toxicity, or hypervitaminosis D, is the toxic state of an excess of vitamin D. The normal range for blood concentration of 25-hydroxyvitamin D in adults is 20 to 50 nanograms per milliliter (ng/mL).
Because many fungi and protozoa cannot survive without ergosterol, the enzymes that synthesize it have become important targets for drug discovery. In human nutrition, ergosterol is a provitamin form of vitamin D 2; exposure to ultraviolet (UV) light causes a chemical reaction that produces vitamin D 2.
READ MORE. How much vitamin D do I need? Older adults need about 600 to 800 IU of vitamin D daily, depending on their age. You can get this through a combination of sun exposure and vitamin-D rich ...
Sunlight and vitamin D-rich foods are the best ways to get this important nutrient. According to a large meta-analysis of randomized controlled trials, taking vitamin D supplements was linked with ...
Here are the top vitamin D rich foods you'll need to add to keep your levels up to par: Supplements vs. Food. When it comes to vitamin D, there are a few foods that naturally contain it, although ...
Ergocalciferol, also known as vitamin D 2 and nonspecifically calciferol, is a type of vitamin D found in food. It is used as a dietary supplement [3] to prevent and treat vitamin D deficiency [4] due to poor absorption by the intestines or liver disease. [5]
Packets of Ready-to-Use Therapeutic Food. Therapeutic foods are foods designed for specific, usually nutritional, therapeutic purposes as a form of dietary supplement.The primary examples of therapeutic foods are used for emergency feeding of malnourished children or to supplement the diets of persons with special nutrition requirements, such as the elderly.
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