Participants were divided into two groups: one received a placebo, while the other received a vitamin D supplement of 60,000 IU per month (which averages about 2,000 IU per day) for up to five years.

Participants took vitamin D supplements for a year at doses of either 600 IU/day or 3750 IU/day. The results indicated that supplementation helped lower their blood pressure. Our study found ...