Oxygen

Oxygen is an odorless and colorless gas that a major component of air and critical to animal and plant life.

ME/CFS
A 1995 study found oxygen delivery to muscles in ME/CFS was impaired and that there was a 20% reduction in oxidative metabolism.

Studies

 * 2019, Peak Oxygen Uptake in Chronic Fatigue Syndrome/Myalgic Encephalomyelitis: A Meta-Analysis.