Vitamin D status is categorized based on serum 25 (OH) D levels, and the half-life of the vitamin is approximately 2 - 4 weeks. However, this half-life may be decreased even less than a week in the event of hemodilution, infection, or other catabolic diseases.D Rise is indicated for the treatment of Vitamin D3 (Cholecalciferol) deficiency. Read more about D rise