How to optimize your website for long-term buyers One of the most impactful experiments when I was Head of Growth at Heights had nothing to do with optimizing the initial conversion rate. It was all about getting customers to take the brain supplement consistently. It was a simple line of copy advising you to take the supplement for at least three months. This was about five years ago, but the copy still survives (with slightly different phrasing and formatting) on their product page to date: Cu