You probably won't notice any CQ-10 effect for at least of couple of weeks of taking it. Someone mentioned having bad side effects above...I don't see how, unless they have a very sensitive stomach. It's not akin to our "take no prisoners" Miracle-Mineral-Supplement dosages. It's just a vitamin.
I'm afraid I've raised expectations too high with all this talk, while the actual benefit just comes on you like a bright idea. You'll be just sitting there thinking about something, then realize how much clearer you can remember things. At least that was my experience.
It's funny that we (alternative health nuts) try all these "new" products without really knowing the dosages that make them work. For example, I had a heavy exposure to liquid mercury for a period of several years without knowing how poisonous it was.
So I started chelating and taking Vitamin C, but felt terrible until I read HOW MUCH vitamin c is necessary to counteract the oxidative stress from the mercury. (For me, 20 or so grams per day!)
But I FELT HUMAN again! It was really great. And also the first time that vitamin C HAD DONE ANYTHING that I could actually feel!
On the other side of the coin, I also took biotin with Epsom Salt baths. (again, for mercury exposure) and TOO MUCH biotin didn't help, but LOWERING the dose improved the result!
You really can't ask anyone about these doseages either. A simple Excel spreadsheet (keeping simple records) will tell you more than any doctor can, about what works for you and at what dosage.
Of course, with Miracle-Mineral-Supplement in the picture, a lot of what works right now, probably won't work the same, once we get rid of all the pathogenic build-up in our bodies. (I hope!)