Winter D-Roster: Verified 75 nmol/L Readiness for Teams and Units

A roster-wide testing-and-dosing service for sports teams and military units: a fall 25(OH)D blood test for every member, a simple daily 1,000 IU vitamin D3 protocol for anyone below the 75 nmol/L immune target, and a mid-winter retest that verifies the whole roster is winter-ready — attacking the colds that sideline more than half of these groups each winter.