CoQ10 is essential for the body. There is no doubt about it. Every organ needs it but it is especially good for the heart.
But if you are over 40 (some say 30) years old, you really should buy ubiquinol, which is the reduced and bioavailable form of CoQ10. I have been using ubiquinol for several months and there is a marked increase in my energy level.
As we get older it is more difficult for CoQ10 to break down properly to provide the amount needed for the body. So, if you are older and taking CoQ10, you can't be completely sure how much ubiquinol that you are getting.
Yes, ubiquinol is expensive but well worth it. Our health food store sells 60 100mg. caps for $49.95. I buy it from Swanson for $21.99 regular price. Sometimes it goes on sale. Purplepixie, I'll bet if you bought ubiquinol you would need to take far less of it than the CoQ10.
BUT, and this is a BIG but. Ubiquinol is distributed by many different supplement companies, so you can compare prices. Just be sure that "Kaneka QH" is on the label. That is the company who developed the process.