The standard dose protecting from the deficiencies in adults with the proper vitamin D3 level amounts for 1,000–2,000 IU a day. Therapeutic doses can be higher, up to 10,000 IU in elderly people and during the autumn/winter period, when the natural synthesis of vitamin D3 is inhibited due to the lack of sunlight.
Vitamin D3 is oil-soluble, which is why it should be taken with a meal containing a good source of fat to ensure optimal absorption.
Vitamin D belongs to fat soluble vitamins, occurs in three forms: calciferol (vitamin D1) ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3), it is formed under the action of sunlight for at least 15 minutes per day. In the absence of sunlight it should be administered in the diet in the form of fish oil (Vitamin A + D3) and fish oils. It is responsible for the absorption of calcium and phosphorus. It is the building substance of bone tissue particularly necessary during pregnancy, childhood, and for athletes. It is a component of dietary supplements and nutrients among competetive athletes. Deficiency of vitamin D causes children growth inhibition, and rickets.
For adults - deficiency causes osteomalacia.
Excess of vitamin D causes headaches, alopecia, nausea, drowsiness, blurred vision, pain in the long bones, the deposition of calcium deposits.
Dosage: 400 IU units during the day.