A total of 282 potentially eligible Caucasian CFS/ME subjects who meet both the 1994 Centers for Disease Control and Prevention/Fukuda's definition and 2003 Canadian case criteria for CFS/ME will be initially enrolled in the study. Those patients who don't meet the inclusion criteria will excluded of the study. All participants will be treatment with ReConnect® containing CoQ10 (50 mg) plus NADH (5 mg) vs. placebo twice daily for 8-weeks in term. Scores for fatigue perception, sleep problems, autonomic dysfunction and QoL will be assess by validated questionnaires of Fatigue Impact Scale (FIS-40), Pittsburgh Sleep Quality Index (PSQI), COMPASS-31 and HRV recording device, and HRQoL (36 item Short Form Health survey), respectively.