It took a couple weeks for me because I started with taking one daily at night, didn't notice much benefit, then took two per dr. recommendation. After that noticed benefit pretty quickly.

One thing I did not expect which the article mentions is the "burps that taste like lavender". It was quite unexpected for me but I personally quite like them. I think my stomach might have gotten used to the lavender though because I would get them ever single time I took them for the first few weeks, and now it's maybe once a week some minor burp.