Working 2 jobs that are physically demanding forced me to try this and I've not regretted it. Very good supplement. Now I'm not as tired and need less sleep than I previously did when napping in between jobs. I stacked it with tongkat Ali and found it even more effective. The d-aspartic acid is something I've used on its own and found that to be great to use. If you are fatigued this will help you a long way. As far as as in between the sheets are concerned this will assist no end of good. Fully recommended