Six months ago my DHEA was 66 range 38-313 mcg/dL. Started taking 100mg DHEA at bedtime about 3 months ago. My latest labs came back a couple weeks ago and my DHEA level was 510. My libido is better, mental energy, and my eyes aren't as dry, go figure. I'm going to cut back by alternating 50 and 100mg. Interesting side note, for a week I started taking my DHEA with all my morning supplements. All the benefits seemed to disappear, not sure why? So I'm back taking it right before bed.