Some studies do not report back significant improvements in insulin sensitivity have used 50mg daily for 3 months in otherwise healthy overweight aged men with low (less than 1500ng/mL) DHEA; DHEA did not even trend towards significance, and appeared to have no directional effect.  This lack of efficacy resulting in no trend towards significance has been noted elsewhere with doses that should normally work.   In post-menopausal women where DHEA would not show efficacy, the combination of DHEA and mixed exercises did not create efficacy of DHEA. 
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