I started taking it last month. According to my saliva test I'm only low at noon, so I take two pellets at noon. I definitely notice a difference in my energy levels. Could be a placebo effect because I noticed a difference as soon as I started taking it. Whatever, it works for me.
Even though my morning levels are supposedly normal I wake up feeling like a corpse so I'm going to start taking it in the morning too and see if it helps.
I've read that symptoms of low AND high cortisol are the same so you shouldn't take it without the test or you could be adding to your troubles.