The antioxidant is becoming quite the buzzy supplement and topical ingredient thanks to its ability to care for the skin.* And despite its popularity (or, perhaps because of its popularity) many people have lots of questions about it. One such question has to do with the various forms of the coenzyme. Such is the case for CoQ10: Its two unique varieties are ubiquinol and ubiquinone. Here, we are diving into the former. Coenzyme q10 (CoQ10) is a fat-soluble compound that’s found in all your cells. It’s known as a “coenzyme” because it’s needed for key enzymes to function: Your cells require CoQ10 to produce energy1.* Specifically, it’s used in the mitochondria, or the “powerhouse” of the cell. Here, electrons move along chemical pathways to make energy (ATP). CoQ10 transports electrons in these pathways, making it an essential player in the game. The energy produced by these pathways is then used for normal cellular functions throughout the entire day (ahem, including those involved in skin health). Additionally, CoQ10 is also a potent antioxidant—the only fat-soluble antioxidant2 naturally made by the human body, in fact. If you want a full guide to CoQ10, we have several guides at your disposal: Here’s everything you need to know about its full-body benefits and skin care benefits.* However, we included an abridged rundown for your reading pleasure—and for convenience. How nice of us. Both forms can be used in both supplements and topicals—however, there are reasons formulators may choose one or the other: