If you really want to repopulate the colon with good bacteria, a faecal transplant must surely be the best option by miles (I don't know if it would reach as far as the ileum; the vast majority of gut bacteria are contained in the colon).
The SCD yoghurt may contain a
lot of bacteria, but it only contains 2 species; 3 at most.
www.breakingtheviciouscycle.info/knowledge_base/detail/yoghurt-what-kind-of-yoghurt-starter-to-use/But the human gut contains anything up to 1000 species of bacteria.
en.wikipedia.org/wiki/Human_microbiome#BacteriaNow the thing is, while a faecal transplant should in theory provide the full array of bacterial diversity, its use as a treatment in Crohn's disease has not been proven to be effective. (It's somewhat more effective in UC, but where faecal transplants really shine as a treatment is in treating resistant c. diff infections).
My point is I don't personally believe the gut flora has a lot to do with Crohn's. I'm quite prepared to believe the flora is disordered; it's just that treating it doesn't seem to have any effect on Crohn's.
If I had an 11-year-old kid with Crohn's, I'd consider an enteral nutrition diet or Entocort as a short-term stop gap, and 6MP or Imuran as a longer-term solution. (Or, possibly, Remicade but
not with 6MP or Imuran.)
I'm sorry I cannot be more helpful. This disease just sucks, in all honesty.