Inclusion criteria
fatigue
Healthy males and females aged between 40 and 75 years; experiencing low energy; fatigue, based on a score of 9 or more on the PROMIS-29 fatigue subscale score; and moderate-to-high stress, based on a score of 14 or higher on the Perceived Stress Scale (PSS) (primary outcome); a non-smoker; with a body mass index (BMI) between 25 and 35 kg/m