Lactobacillus acidophilus NCFM (ATCC SD5221)

Sadrin S, Sennoune S, Gout B, Marque S, Moreau J, Zinoune K, et al. A 2-strain mixture of Lactobacillus acidophilus in the treatment of irritable bowel syndrome: a placebo-controlled randomized clinical trial. Dig Liver Dis. 2020 May;52(5):534–40.