Vitamin D Status Affects Sleep Health (& A Supplement Can Help)

For the record, that’s 1,822 IU below the amount of vitamin D an adult would need to avoid gross deficiency (i.e., 2,000 IU to avoid a failing vitamin D level of less than 20 ng/ml), and a whopping 4,822 IU less than the necessary daily dosage (5,000 IU) to achieve truly optimal vitamin D levels (50 ng/ml)!