 Phase 1 - Healthy males or females, 19 and 50 years of age, will be recruited from the general public. Consented study participants will provide a fasting blood and urine sample for the purpose of determination of vitamin D status insufficient vs. deficient based on serum 25OHD concentrations. Forty-five 45 individuals identified as vitamin D insufficient having a serum 25OHD concentration 30 and 75 nmolL will proceed to phase II. A N20 10 vitamin D insufficient and 10 vitamin D deficient will also be identified to satisfy objective 1. 