How long does it take to notice the changes? If I try out a single bottle, as offered on your site, will I likely be feeling as much difference as I'm going to

How long does it take to notice the changes? If I try out a single bottle, as offered on your site, will I likely be feeling as much difference as I'm going to feel by the time I finish it? I am also curious about the details of the "much more ambitious" study mentioned in the FAQ. Are those still coming soon? (Accidentally hitting Escape while on the site dropped me into a settings page login. It was disorienting.)