This site's own FAQ addresses this directly: supplements like this work gradually. Bacopa studies usually ran for about 12 weeks before measuring memory, so plan on two to three months of daily use before judging results.
Worth reading this timeline not as an arbitrary marketing figure, but as this site directly tying its expectation-setting to the cited Bacopa research duration — a more grounded approach than a vague "give it time" answer.
This site adds directly: use the 60-day guarantee window wisely — worth reading that as acknowledging the guarantee window and the full recommended evaluation period aren't identical.