How long does the body store vitamin D for?

Plasma half-life of (ingested) vitamin D is about 4-6 hours. Ingested vitamin D (or newly synthesized Vitamin D) is quickly converted to 25(OH)D which has a half-life of about 15 days in circulation. The 25(OH)D is stored in body fat tissues, where it has a half-life of approx 2 months. “Half-life” means the amount of time taken for the level of the substance to be reduced by half (50%).