|Trial Design||Double blind|
|Number of Subjects||165|
Men taking 3,332 IU of vitamin D for one year, after bringing up serum levels past an average of 50nmol/L increased testosterone from 10.7±3.9 nmol/l to 13.4±4.7 nmol/l. Bioactive and free testosterone also increased.
The increase in testosterone was not seen in women.