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. 2015 Jul 29;2015:318595. doi: 10.1155/2015/318595

Table 2.

Vitamin D levels achieved in 2 studies done at northern latitudes.

  Number Percentage
(1) Higher latitude statistics for high levels of 25(OH)D3, N = 1430 [2]    
 Number of patients with >150 nmol/L of 25(OH)D3 15 1%
 Number of patients with >100 nmol/L of 25(OH)D3 315 22%
 Number of patients with ideal levels 100–150 nmol/L 300 21%
(2) Nursing home study using 2000 IU daily of vitamin D3 for >5 months, N = 68 [63]    
 Number of patients with >150 nmol/L of 25(OH)D3 6 9%
 Number of patients with >100 nmol/L of 25(OH)D3 54 78%
 Number of patients with ideal levels 100–150 nmol/L 48 71%

∗All levels achieved in these patients were well below 375 nmol/L where side effects have been reported.