Effect of Dietary Coenzyme Q10 Plus NADH Supplementation on Fatigue Perception and Health-Related QoL in ... ME/CFS, 2021, Castro-Marrero et al.

From the Clinical Trials register - the supplement is branded, and there was an objective outcome (HRV) which was not mentioned in the study, and the promised autonomic function results were also not reported.

It looks as though this team has another trial underway, also aiming to provide a 'scientifically proven!' stamp for another commercial supplement:

Clinical Trial to Assess the Improvement of Fatigue, Sleep Problems, Anxiety / Depression, Neurovegetatives Alterations and Quality of Life After the Administration of ImmunoVita® in Chronic Fatigue Syndrome Patients​