Probiotic microbes sustain youthful serum testosterone levels and testicular size in aging mice. Poutahidis T, Springer A, Levkovich T, et al. Probiotic microbes sustain youthful serum testosterone levels and testicular size in aging mice. PLoS One. 2014;9(1):e84877. doi:10.1371/journal.pone.0084877 Read more