Footballers get a vitamin d boost: High-Dose pills and exercise studied

This study looked at how a single high dose of vitamin D (500,000 IU) combined with football-specific exercise changes vitamin D levels in 20 professional male football players. The players were split into two groups: one got the vitamin D pill, the other got a placebo. Blood tests before and after a game showed that the vitamin D pill greatly increased vitamin D levels, and exercise also helped raise them. The study was small and only measured short-term effects, so it doesn't prove any long-term health benefits.