The formulation of the Coenzyme Q10 supplement is of utmost importance. Formulation affects absorption. Absorption affects efficacy. Not all Coenzyme Q10 supplements give the same level of absorption.
Coenzyme Q10 molecules are fairly large, fat-soluble molecules. Coenzyme Q10 has a six-carbon benzoquinone ring as its head and a ten-unit isoprenoid tail that is strongly hydrophobic. For best absorption, Coenzyme Q10 needs to be ingested together with a meal containing some fat. Despite some claims to the contrary, it is not possible to re-make Coenzyme Q10 into a water-soluble substance. Such a product no longer has the properties of Coenzyme Q10 [Judy 2018].