Low cortisol became a recurring phrase in online wellness culture as creators talked about stress, rest and slower living, and the term moved from health explainers into aesthetic edits. The sound is used the way a mood tag is used: drop it over a video and the clip reads as calm, intentional and unhurried. It shows up most in TikTok and Reels routines, resets and day-in-my-life videos, where the audio's steady, gentle pacing does the storytelling. Rather than belonging to one video, it belongs to the broader low-stress aesthetic that keeps trending in short-form feeds.