Interesting with lactulose-- wikipedia states that it is designed to increase acetic and lactic acid in the colon that increases peristalisis. I always thought that the acids that our flora produced in the colon stimulates peristalisis. Wikipedia did recommend lactulose for people with SIBO.

So I imagine lactulose inhibits candida because of the acetic acid and lactic acid production ?

"Moreover, lactulose is converted to lactic and acetic acid which results in acidification of colonic contents. The low pH decreases passive non-ionic diffusion of ammonia thus lowering its systemic concentration. Furthermore, with its prebiotic potential, lactulose also encourages growth of probiotic bacteria such as Bifidobacterium species that are known to have health-promoting effects.[4]"--wikipedia

Interesting--- "the low ph decreases passive non-oinic diffusion of ammonia thus lowering its systemic concentration"

http://en.wikipedia.org/wiki/Lactulose