A 2021 examine carried out in Korea put these two strategies of getting vitamin D to the check. Vitamin-D-deficient individuals got the selection between daylight publicity and a modest stage of oral vitamin D supplementation (1,000 I.U. of D3 taken day by day, to be precise). 

Serum 25(OH)D ranges (i.e., the blood biomarker for vitamin D standing) have been evaluated firstly and finish of the three-month examine to doc modifications. The daylight publicity group had no important enhance in common serum 25(OH)D ranges, whereas the oral supplementation group noticed a median serum enhance of 11 ng/ml on the finish of the three months. 

In different phrases, vitamin D ranges elevated in individuals that took 1,000 I.U. of vitamin D3, whereas these uncovered to the solar skilled no important modifications. This confirmed what mindbodygreen has identified all alongside: Vitamin D supplementation is the simplest and environment friendly methodology of elevating vitamin D to ranges of sufficiency.* 

Diet scientist Ashley Jordan Ferira, Ph.D., RDN, shared these extra insights: “This examine is efficacious for 2 causes. First, it demonstrates the efficacy of vitamin D supplementation in positively affecting vitamin D standing. Second, it confirms the pharmacokinetic research-backed phenomenon that predicts 1,000 I.U. of vitamin D3 will transfer the 25(OH)D “needle” by about 10 ng/ml in normal-weight adults. That predictable math is the rationale why we really want far more vitamin D, round 5,000 I.U. or extra, to attain and preserve vitamin D sufficiency all through life.”*