the effect of probiotic supplementation on body composition, muscle thickness, and athletic performance in division i collegiate athletestownsend jr, toohey jc, johnson sb, crimi cc, stowers kl, bender d, vantrease wc, toy, am, ruiz md, vandusseldorp ta, feito y, mangine gt. the effect of probiotic supplementation on body composition, muscle thickness, and athletic performance in division i collegiate athletes. poster presented at: international society of sport nutrition (issn) annual conference; june 22-24, 2017; phoenix, az.