In order to increase your body's supply of vitamin D, it is possible to use either vitamin D supplements, dietary supplements or special balanced diets which are subject to a prescription. Depending on the classification, the amount of vitamin D in each preparation is different.
For vitamin D supplements, dosages of up to 1,000 I.U. (international units) per dose are obtainable without prescription. A distinction is made between vitamin D3 (animal vitamin D from wool / lanolin, cholecalciferol) and vitamin D2 (vegetable vitamin D from fungi, ergocalciferol). Balanced diets may also contain vitamin D.
The daily intake of vitamin D recommended by the German Nutrition Society (DGE) is 800 I.U. This value seems far too low considering the research. The Canadian Pediatric Society recommends 2,000 I.E. per day for expectant mothers. The Federal Office for Risk Assessment (BfR) cites 2,000 I.E as the upper limit for daily intake.
Studies show that with a supplementation of 2,000 I.E. a vitamin D level can be stabilised. Orthomolecular physicians recommend up to 5,000 I.U. However, this is usually not enough to correct a low vitamin D level. The body's stores must first be filled.
Therapeutically, vitamin D is administered in doses of up to 50,000 I.U.
To optimize the performance of all vitamin D positively influenced bodily functions, a blood concentration of 40-60 ng / ml is the ideal. If your vitamin D concentration is greatly reduced, the level may not be sufficiently increased by the administration of over-the-counter preparations alone. In these cases a doctor should be consulted and your level of vitamin D checked regularly.