The results from large dog studies done by SIBR Research show that orally administered ubiquinol is mostly converted to the ubiquinone form of Coenzyme Q10 by the time it reaches the small intestines [Judy 2021 Part 2].
In the small intestines, it is then absorbed primarily as ubiquinone. Once it enters the lymph, it is increasingly converted back to ubiquinol.
By the time it leaves the lymph to enter the blood circulation, it is approximately 96 % ubiquinol again.
These findings beg the question: why buy a ubiquinol supplement when the ubiquinol will probably be converted to the ubiquinone form of Coenzyme Q10 prior to absorption?