L.Reuteri ATCC 6475 Sustains Youthful Serum Testosterone Levels and Testicular Size in Aging Mice User MaximilianKohler, in the Microbiome subreddit, 13 May 2016
probiotics for PCT? (x-post from /r/supplements) "...male mice...had larger testicles and increased serum testosterone levels compared to their age-matched controls." User milehibroncoguy, in the Discuss safe steroid usage and ask questions. subreddit, 16 Mar 2014
PLOS ONE: Probiotic Microbes Sustain Youthful Serum Testosterone Levels and Testicular Size in Aging Mice User burtzev, in the Reddit Science subreddit, 03 Jan 2014