B12 is a natural metabolism booster. Think of it as an energy drink without all the awful chemicals and mounds of caffeine. B12 can only be taken periodically, and is not for use at night.
100mg each of L-Ornithine, L-Arginie, and L-Citruline. Boosts metabolism before a workout, and aids in muscle repair after athletic activity. Be sure to check your sanctioning body if involved in organized sports. Powerful enough to not be allowed by certain organizations.
CoQ10 (Ubiquinone) is the coenzyme given to heart attack and heart surgery patients during recovery. It's one of the most powerful cardiac enzymes available, and is frequently recommended by such places as the Mayo Clinic. Bookings can only be made 72 hours in advance.