I have been taking both L-cartenine & Q-10 for the last 2 weeks and have not noticed any difference at all.
I am going to go ahead and pick up another supply (I found it at Walgreen's and CVS drugstores) even though it IS pretty pricey, as some supplements take a while to have any impact on your system.
All I can say is that wilth all of the vitamins, minerals, and supplements I am taking....I should be healthy as a horse!!!