Effect of the probiotic strain Bifidobacterium animalis subsp. lactis, BB-12®, on defecation frequency in healthy subjects with low defecation frequency and abdominal discomfort: a randomised, double-blind, placebo-controlled, parallel-group trial.
Dorte Eskesen, Lillian Jespersen, Birgit Michelsen...
https://pubmed.ncbi.nlm.nih.gov/26382580