Effects of vitamin D and quercetin, alone and in combination, on cardiorespiratory fitness and muscle function in physically active male adults.

Open Access J Sports Med · 2015 · PMC4521671 · PMID 26244032

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an increasing trendno p-value reported

Supplementation with vitamin D significantly increased serum 25(OH)D concentration (by 87.3% in the vitamin D group, P <0.001) and was associated with an increasing trend of testosterone concentration.

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