Premier Research Labs CoQ-10 is produced through a natural fermentation process which yields 100 mg/capsule of the highly bioavailable, preferred trans isomeric form of CoQ-10. Our process does not use polysorbate 80 (an emulsifier made from polyethoxylated sorbitan), undesirable flowing agents or other excipients. The natural trans-isomer of CoQ-10 is the most desirable because it is identical to the CoQ-10 produced by all cells in the body. CoQ-10 is found in the highest concentrations in tissues with the highest rate of metabolic activity and energy demands (such as in the heart, muscle, liver, kidney and brain).