Gonzalez, M., Reed, M., Fowkes-Godik, S., & Cattano, N. (2016). The effects of testosterone boosters on testosterone, strength, and body composition in young trained males. Medicine & Science in Sports & Exercise, 48(5), Supplement abstract number 234.

This study investigated if testosterone, strength, and lean body mass are increased in young trained males taking an herbal testosterone supplement compared to a placebo during a 6-week resistance-training period. Ss were randomly assigned to the placebo group (N = 6) or the experimental group (N = 5). Ss and researchers were blinded to group assignments. Blood and saliva samples were collected in the fasted state prior to the intervention (pre), three weeks (mid), and six weeks (post) to measure testosterone. 1 RM squat and bench press and body composition were measured at all three time points. Ss were supplemented with the herbal testosterone booster or 500mg of oregano in capsule form twice daily.

No significant difference was detected between groups for % change in squat or bench. There was no significant difference between groups for unbound serum testosterone % change from pre to post as well as between groups for unbound serum testosterone concentrations. No significant difference occurred between groups for total saliva testosterone % change from pre to post. A significant difference was detected between groups post-test saliva testosterone concentration as well as for % weight change for the experimental group compared to the placebo group from pre- to mid-experiment.

Implication. Supplementation with a testosterone booster during a resistance training intervention does not increase testosterone, strength, or lean body mass when compared to a placebo.

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