The effects of intermittent vitamin D3 supplementation on muscle strength and metabolic parameters in postmenopausal women with type 2 diabetes: a randomized controlled study.

Background: The aim of this study was to evaluate the effect of weekly vitamin D3 supplementation on metabolic parameters and muscle strength of postmenopausal women with type 2 diabetes.

Methods: A total of 38 patients with serum 25-hydroxy vitamin D [25(OH)D] below 30 ng/ml and hand strength below 20 kg were randomly assigned to oral vitamin D3 (6600 IU/week in 2 cc oil preparation) or 2 cc olive oil weekly for 3 months.

Results: There were nonsignificant increases in serum 25(OH)D in the intervention group to 22.