Here’s a useful feature for a Limitless Pill (NZT-48) movie scenario, grounded in the original concept of unlocking full brain potential:

After taking the pill, the user can mentally rewind through any sensory input they’ve ever been exposed to—even if they didn’t consciously notice it at the time. For example, they could recall a stranger’s phone number glimpsed for a split second on a bus, or replay a conversation from years ago that holds a hidden clue.