Ubiquinone or Ubiquinol – does it really matter? https://icqaproject.org/wp-content/uploads/bsk-pdf-manager/22_10_GB_UBIQINOL_UNIQINOL_FACTSHEET_A4_1014-2.PDF

> Ubiquinol has a milky white appearance, whereas ubiqui- none is yellowish. The best way to test if the content in a ubiquinol capsule is really what it claims to be is to pierce the capsule and squeeze out the content. If it is yellowish, there is a risk that it has oxidized and turned into ubiqui- none. In that case, you have not received what you paid for.