Effect of repeated consumption of partially hydrolyzed guar gum on fecal characteristics and gut microbiota: A randomized, double-blind, placebo-controlled and parallel-group clinical trial 

This randomized, double blind, placebo controlled, and parallel trial from 2019 was performed on 44 healthy volunteers (22 males, 22 females, 41.9 ± 6.3 years old (average ± SD) with minimum seven bowel movements every week, wherein above 50% of their stool was between the Bristol stool scale (BSS) value of five and six. Intake of the PHGG for three months significantly improved stool form, evaluated using BSS, and had no effects on stool frequency. BSS was significantly normalized in the group consuming the PHGG compared with the placebo.  

References:

Yasukawa, Z., Inoue, R., Ozeki, M., Okubo, T., Takagi, T., Honda, A., & Naito, Y. (2019). Effect of Repeated Consumption of Partially Hydrolyzed Guar Gum on Fecal Characteristics and Gut Microbiota: A Randomized, Double-Blind, Placebo-Controlled, and Parallel-Group Clinical Trial. Nutrients, 11(9), 2170. https://doi.org/10.3390/nu11092170