Chronic Fatigue Syndrome, as known as Myalgic Encephalomyelitis (CFS/ME) is a complex and extremely debilitating chronic condition, with no known cause, no established diagnostic tests, and no universal effective therapy. Its symptoms are mainly unexplained disabling fatigue that lasts for six months or more and that does not improve with rest, worsing with physical and mental activity. It is associated with other concomitant symptoms including muscle pain, post-exertional malaise lasting more than 24h, unrefreshing sleep, autonomic dysfunction and cognitive problems worsing quality of life of sufferers. Previous studies have shown that CFS/ME subjects have a significant decrease in CoQ10 and NADH levels in plasma and peripheral blood mononuclear cells (PBMCs), correlating with symptoms of the condition. Hypothesis: CoQ10 plus NADH administration could be beneficial in the improvement of outcome measures and molecular parameters in CFS/ME individuals.