Coenzyme Q10 exists in two interchangeable chemical forms, ubiquinone and ubiquinol. Our bodies’ ability to convert ubiquinone into ubiquinol, however, declines with age. So taking a ubiquinol supplement over the age of 35 is recommended: this ready-to-use form of coenzyme Q10 does not need to be converted anymore. QuattroCardio® supplies 100 mg ubiquinol a day, whereas food contains this form only in lower quantities. Ubiquinol is mainly found in offal (e.g. pig’s heart, 20 mg/100 g) and to lower extent in poultry (e.g. chicken leg 2 mg/100 g) or fish (e.g. trout 1 mg/100 g).