3.9. Blinding Efficacy
At the end of the study, 9 out of 19 (47%) participants in PRO + FB were able to successfully guess that they had been provided with the active supplement (9 guessed the active supplement, 6 the placebo, and 4 answered, “I don’t know”). Overall, 13 out of 20 (65%) participants in PRO were able to successfully guess that they had been provided with the placebo (6 guessed the active supplement, 13 the placebo, and 1 answered, “I don’t know”).