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Vitamin C supplements among other dietary supplements at a US drug store. Vitamin C has a definitive role in treating scurvy, which is a disease caused by vitamin C deficiency. Beyond that, a role for vitamin C as prevention or treatment for various diseases is disputed, with reviews often reporting conflicting results.
About 70–90% of vitamin C is absorbed by the body when taken orally at normal levels (30–180 mg daily). Only about 50% is absorbed from daily doses of 1 gram (1,000 mg). Even oral administration of megadoses of 3g every four hours cannot raise blood concentration above 220 micromol/L. [19]
Doses greater than 40 000 IU (1000 μg) per day are generally required before high blood calcium occurs. [12] Normal doses, 800–2000 IU per day, are safe in pregnancy. [5] Cholecalciferol was first described in 1936. [13] It is on the World Health Organization's List of Essential Medicines. [14]
Industrially, 7-DHC generally comes from lanolin, and is used to produce vitamin D3 by UV exposure. [12] Lichen (Cladonia rangiferina) is used to produce vegan D3. [13] [14] 7-DHC is used for vitamin D3 synthesis via lanosterol in land animals, via cycloartenol in plants, and in algae together with another provitamin D ergosterol for D2. In ...
In the United States, a multivitamin/mineral supplement is defined as a supplement containing three or more vitamins and minerals that does not include herbs, hormones, or drugs, where each vitamin and mineral is included at a dose below the tolerable upper intake level as determined by the Food and Drug Board, and does not present a risk of ...
Calcium and Vitamin D3 are often combined, with claims for adult bone health (This label predates current U.S. Food and Drug Administration regulations on health claims. [ 92 ] ) Characteristics of osteomalacia are softening of the bones, leading to bending of the spine, bone fragility, and increased risk for fractures. [ 1 ]
It is used to prevent and treat lack of calcium and vitamin D in the elderly, as well for osteoporosis in combination with other medications. [ 1 ] [ 2 ] In 2022, the combination, calcium/vitamin D was the 246th most commonly prescribed medication in the United States, with more than 1 million prescriptions.
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 ]
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1540 Olentangy River Rd, Columbus, OH · Directions · (614) 299-2253