Vitamin D is a group of fat-soluble prohormones, the two major forms of which are vitamin D2 (or ergocalciferol) and vitamin D3 (or cholecalciferol). The term vitamin D also refers to metabolites and other analogues of these substances. Vitamin D3 is produced in skin exposed to sunlight, specifically ultraviolet B radiation.
Vitamin D plays an important role in the maintenance of organ systems.
Vitamin D regulates the calcium and phosphorus levels in the blood by promoting their absorption from food in the intestines, and by promoting re-absorption of calcium in the kidneys, which enables normal mineralization of bone and prevents hypocalcemic tetany. It is also needed for bone growth and bone remodeling by osteoblasts and osteoclasts.
Vitamin D affects the immune system by promoting phagocytosis, anti-tumor activity, and immunomodulatory functions.
Vitamin D deficiency can result from inadequate intake coupled with inadequate sunlight exposure, disorders that limit its absorption, conditions that impair conversion of vitamin D into active metabolites, such as liver or kidney disorders, or, rarely, by a number of hereditary disorders. Deficiency results in impaired bone mineralization, and leads to bone softening diseases, rickets in children and osteomalacia in adults, and possibly contributes to osteoporosis. However, sunlight exposure, to avoid deficiency, carries other risks, including skin cancer; this risk is avoided with dietary absorption, either through diet or as a dietary supplement.
±Comparisons based on independent lab tests conducted in October 2005 (Lot #FJ41315203A), April 2006 (Lot #01B614) and June 2006 (Lot #00438326, #T01 and #S060982). The product and company names are registered trademarks of their respective companies.
| Vitamins | Daily Value |
Mangosteen Plus™± |
Thai-Go™± | XanGo®± | Naturally Thai Mangost een± |
Mango•xan®± |
| Beta Carotene IU/oz |
5000 IU | 2,500 | <5 | 5.4 | 347 | <5 |
| Vitamin C mg/oz |
60 mg | 410 | < 0.1 | 5.2 | 0.10 | 65.6 |
| Vitamin D3 IU/oz | 400 IU | 1107 | 43.5 | 24.2 | 0 | < 5 |
| Vitamin E as d-alpha tocopherol IU/oz |
30 IU | 63.04 | 0.45 | < 0.1 | 0.37 | 2.46 |
| Vitamin B1 mg/oz |
1.5 mg | 1.83 | < 0.5 | < 0.5 | < 0.5 | < 0.5 |
| Vitamin B2 mg/oz |
1.7 mg | 2.14 | < 0.5 | < 0.5 | < 0.5 | < 0.5 |
| Vitamin B6 mg/oz |
2 mg | 6.05 | < 0.5 | < 0.5 | < 0.5 | < 0.5 |
| Vitamin B3 mg/oz |
20 mg | 23.52 | < 0.5 | < 0.5 | < 0.5 | < 0.5 |
| Folic Acid mcg/oz |
400 mcg | 870 | < 10 | < 10 | 35.97 | < 0.5 |
| Vitamin B12 mcg/oz |
6 mcg | 15.60 | < 5 | < 0.5 | < 0.5 | Interfered±± |
| Biotin mcg/oz |
300 mcg | 312 | 36 | < 20 | 38.58 | < 20 |
| Pantothenic Acid mg/oz | 10 mg | 13.86 | < 1 | < 1 | 1.64 | Interfered±± |
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