According to a pilot study of 20 people conducted at a major university, daily doses of a compound called arabinogalactan over a period of 8 months resulted in a significant increase in the beneficial lactobacillus
species of bacteria, Why can't it be concluded that the compound is beneficial for the majority of people?
It is not known if lactobacillus is beneficial to everybody,
Ob
Only 20 people were used in the study,
The study did not last long enough
The people studied were not selected randomly,