Function

"It’s time you own your health. Function includes 160+ lab tests and personalized protocols for instant action. Tracked over time in one secure place." That is how Function introduces itself. Measured against the twelve signals AI engines rely on, it scores 7.2 out of 10, a strong showing.

On its own pages the site does well on structured data describing the business, a clear heading structure, a clearly stated business identity and sitemaps and entity links AI can follow. It is passable on a few credibility markers. What holds it back is the technical files AI engines look for, such as llms.txt or an open robots.txt.

Off the page, other sites link to it and it comes up on Reddit. There is some, but not much, sign that the domain is only lightly established and press coverage is thin. Beyond that, AI engines do not yet recognise it as a distinct business and nobody is discussing it where AI engines look.

AI crawlers have visited 5 times in our tracking, including OAI-SearchBot (OpenAI), Applebot (Siri) and ClaudeBot (Anthropic). It does link out to several social profiles, which helps engines tie the brand together. The business dates to 2022.