When I first started taking Carbolin 19, I was taking the recommended 1 cap twice per day (separated by six hours).
But after a little tweaking, I have found that taking 2 caps before I train (which is first thing in the morning) and a single cap about 5 - 6 hours later is best.
Using the above protocol, I managed to lose about 5 pounds of fat and put on 6 pounds of muscle. Also, all my big lifts have gone up and stayed there. (P.S. Don't neglect nutrition while using Carbolin 19. You can increase your gains that much more with a solid eating plan)
I did try taking 2 caps twice per day, but found that the slight advantage it granted didn't warrant the extra cost.
Then again, this is just my personal experience. You must play and tweak and find out what works best for you.