Measure your Antioxidant Power

O2Score provides a scientific quantification of fatigue

Resulting from research and development efforts carried out at EPFL (Switzerland), validated for several years by professional athletes and coaches in various disciplines, O2score is a robust pointer of the antioxidant power.





Every physical exertion causes the production of free radicals. The imbalance between free radicals and antioxidants generates oxidative stress at the cellular level. Our body will adapt to produce more antioxidants when the right training load is applied.

 An excessive or inadequate training load can lead to an imbalance in free radicals and antioxidants, causing severe oxidative stress.

Through the interactive mobile App, users can track their oxidative stress throughout a training cycle to make sure they are creating positive adaptations without causing cell damage.

Users / Ambassadors


Starter Kit: O2score System + 8 sensors + 8 lancets

Elite Kit: O2score System + 250 sensors + 250 Lancets

Refills (50): 50 sensors
+ 50 lancets


How often should I monitor my oxidative stress?

As little or as often as you desire. Your oxidative stress may change daily depending on the stimulus you have given to your body. You may want to wait a couple of days between tests.

Does this device require a blood sample?

Yes, the lancets draw a small amount of blood through a prick of the finger, this is required for accurate and reliable testing.

What is the benefit of oxidative stress over lactic acid testing?

It is not a even comparison, the two could be used together for highly monitored training. The half-life of lactic acid is 20 minutes, so it can be utilised during workouts. Yet you can still be very fatigued the day after a hard workout. oxidative stress markers may peak 24-72hours post exercise and can be detected for up to 7 days post exercise.