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2. Vitamin D deficiency - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D_deficiency

   Vitamin D deficiency is typically diagnosed by measuring the concentration of the 25-hydroxyvitamin D in the blood, which is the most accurate measure of stores of vitamin D in the body. [1][7][2] One nanogram per millilitre (1 ng/mL) is equivalent to 2.5 nanomoles per litre (2.5 nmol/L). Severe deficiency: <12 ng/mL = <30 nmol/L[2] Deficiency ...

3. Vitamin D - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D

   Vitamin D 5. sitocalciferol. (made from 7-dehydrositosterol) Several forms (vitamers) of vitamin D exist, with the two major forms being vitamin D 2 or ergocalciferol, and vitamin D 3 or cholecalciferol. [ 1 ] The term 'vitamin D' refers to either D 2 or D 3, or both, and is known collectively as calciferol.

4. Vitamin D and respiratory tract infections - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D_and_respiratory...

   Vitamin D supplementation. Proponents of the vitamin D hypothesis have recommended dietary supplements (5,000 International Units (IU)/day for adults and 1,000 IU/day for every 25 pounds of body weight in children) and suggested that larger doses (2,000 IU/kg/day for 3–4 days) could be used to treat influenza.

5. 10 Best Vitamin D Supplements, According to Dietitians - AOL

   www.aol.com/10-best-vitamin-d-supplements...

   These capsules deliver 2,000 IU of vitamin D, providing a potent dose to support your bone health and immune function. Kirkland's extra strength formula is ideal for those requiring higher levels ...

6. Reference Daily Intake - Wikipedia

   en.wikipedia.org/wiki/Reference_Daily_Intake

   Reference Daily Intake. In the U.S. and Canada, the Reference Daily Intake (RDI) is used in nutrition labeling on food and dietary supplement products to indicate the daily intake level of a nutrient that is considered to be sufficient to meet the requirements of 97–98% of healthy individuals in every demographic in the United States.

7. Calcitriol - Wikipedia

   en.wikipedia.org/wiki/Calcitriol

   Regular blood tests are recommended after the medication is started and when the dose is changed. [12] Calcitriol was identified as the active form of vitamin D in 1971 and the drug was approved for medical use in the United States in 1978. [7] It is available as a generic medication. [12]