Coenzyme Q10 (CoQ10) exists in two main forms: ubiquinone and ubiquinol. Both forms are critical for cellular energy production, but they have distinct characteristics and roles within the body.
Ubiquinone
Ubiquinone is the oxidised form of CoQ10. It has a quinone structure with a long isoprenoid side chain.
In the mitochondrial electron transport chain (ETC), ubiquinone accepts electrons from complex I and complex II. This electron acceptance converts ubiquinone into its reduced form, ubiquinol.
Ubiquinol
Ubiquinol is the reduced form of CoQ10. It has a quinol structure, with two additional hydrogen atoms compared to ubiquinone, making it more electron-rich.
After accepting electrons, ubiquinone is reduced to ubiquinol. Ubiquinol then transfers these electrons to complex III in the ETC, continuing the process of ATP synthesis.
Ubiquinol is a powerful lipid-soluble antioxidant, protecting cell membranes and lipoproteins from oxidative damage by neutralizing free radicals.
Learn more about ubiquinone and ubiquinol here.
Which should i opt for- ubiquinol or ubiquinone?
We recommend ubiquinol- as it's bioavailable.
Ultimately, both forms contribute to energy production and cellular health, but ubiquinol may offer superior benefits in scenarios where quick absorption and bioavailability are critical.
Supplementation

Traditionally, ubiquinone has been the most common form in supplements. However, it must be converted to ubiquinol in the body before it can be effectively utilised, a process that may be less efficient in some individuals, especially as they age or have certain health conditions.
Ubiquinol is already in its reduced, active form, making it more readily absorbed and utilized by the body. This enhanced bioavailability makes ubiquinol a preferred choice for individuals who may have difficulty converting ubiquinone to ubiquinol.
Ubiquinol doses might be lower than ubiquinone for equivalent effects due to its better absorption. It’s available in various formulations, including soft gels and oil-based capsules designed to enhance bioavailability.
Speak to a healthcare provider before taking any new supplement.