My husband and I both use this product in addition to our multivitamin for added energy and general all around well being. He and I both have aging hormonal changes and have suffered with night sweats on occasion. It seems this supplement has basically stopped that for both of us! I was taking 1 tablet for a long time and didn’t “feel” any difference or improvement. I was about to discontinue its use, but invested time in researching more thorough before doing so. I found it takes 2,000-3,000 mg for its best effective dose…and yes indeed after we began taking three of the 800 mg tablets we began to feel a difference! The energy it produces is not a caffeine type feel…it literally just makes you feel awake and alert and ready to go. This will always be part of our daily vitamin/supplement regimen.