Association of vitamin D status with serum androgen levels in men

P>Objective Studies in rodents indicate a role of vitamin D in male reproduction, but the relationship between vitamin D and androgen levels in men is largely unexplored. We aimed to investigate the association of 25-hydroxyvitamin D [25(OH)D] levels with testosterone, free androgen index (FAI) and SHBG. Moreover, we examined whether androgen levels show a similar seasonal variation to 25(OH)D. Design In this cross-sectional study, 25(OH)D, testosterone and SHBG levels were assessed by immunoassay in 2299 men who were routinely referred for coronary angiography (1997-2000). Measurements Main outcome measures were associations of 25(OH)D levels with testosterone, SHBG and FAI. FAI was calculated as testosterone (nmol/l)/SHBG (nmol/l) x 100. Results Men with sufficient 25(OH)D levels (>= 30 mu g/l) had significantly higher levels of testosterone and FAI and significantly lower levels of SHBG when compared to 25(OH)D insufficient (20-29 center dot 9 mu g/l) and 25(OH)D-deficient (< 20 mu g/l) men (P < 0 center dot 05 for all). In linear regression analyses adjusted for possible confounders, we found significant associations of 25(OH)D levels with testosterone, FAI and SHBG levels (P < 0 center dot 05 for all). 25(OH)D, testosterone and FAI levels followed a similar seasonal pattern with a nadir in March (12 center dot 2 mu g/l, 15 center dot 9 nmol/l and 40 center dot 8, respectively) and peak levels in August (23 center dot 4 mu g/l, 18 center dot 7 nmol/l and 49 center dot 7, respectively) (P < 0 center dot 05 for all). Conclusion Androgen levels and 25(OH)D levels are associated in men and reveal a concordant seasonal variation. Randomized controlled trials are warranted to evaluate the effect of vitamin D supplementation on androgen levels.