The purpose of this investigation was to determine the effects of supplementing with 100 mg daily of 5-Hydroxytryptophan (5-HTP) on indices of body composition in exercise-trained men and women. Sixty-one subjects volunteered for this investigation. Forty-eight subjects were randomized into a treatment (n = 31, 12 male/19 female; 100 mg 5-HTP daily; CLEANMOOD™) or a placebo (n = 17, six male/11 female; maltodextrin). Body composition was assessed pre- and post-treatment after eight weeks via a multi-frequency bioelectrical impedance device (InBody® 270). Subjects were instructed to not change their training or eating habits; moreover, they were instructed to track their diet ∼2-3 days per week using a mobile app (MyFitnessPal). There were no changes in food intake (i.e. total energy intake or grams of macronutrients) between or within groups. Lean body mass, total body water, and % body fat did not change significantly in either group. Fat mass decreased significantly post versus pre in the 5-HTP group (p = 0.02) but did not change in the placebo group (p = 0.58). Moreover, changes in fat mass were significantly different between the 5-HTP and placebo group (p = 0.048). Based on the limited data from this investigation, daily supplementation with 100 mg of 5-HTP may affect body composition.
Keywords: Body composition; dietary supplement; exercise; performance.