Which Structured Data Actually Helps AI Citations?

I spent three months adding schema markup to every page on a test site. Product schema, Organization schema, LocalBusiness schema, the works. Most of it did nothing for AI citations.

The stuff that did work? FAQPage, Article, and HowTo. Everything else was wasted effort, at least for citation purposes.

The schema that actually matters

FAQPage schema: +34% citation rate

This is the clear winner. When you mark up question-answer pairs, you're basically handing AI systems exactly what they want: pre-packaged answers they can extract without parsing your prose.

The markup itself is simple. A FAQPage type with an array of Question objects, each containing an acceptedAnswer. Takes maybe 15 minutes to implement the first time, less than five once you have a template.

One thing I didn't expect: the schema needs to match your visible content. I tried adding FAQ schema for questions that weren't actually on the page. Google's Rich Results Test passed, but citation rates didn't improve. AI systems apparently check.

Article schema: +18% citation rate

Article schema tells AI systems when your content was published and updated. The dateModified field matters most. Fresh content gets cited more, and this schema makes freshness easy to verify.

Author information might matter too, but I haven't been able to isolate its effect. Too many confounding variables.

HowTo schema: +22% for instructional content

If you have step-by-step content, mark it up. AI systems responding to "how to" questions prefer content that's already broken into steps.

The schema that doesn't matter

I tested these and found no measurable impact on AI citations:

Product schema, unless you're specifically targeting product queries. Event schema. Recipe schema (unless you're a food site, obviously). Review schema. LocalBusiness schema.

These might still be worth implementing for Google search features, but they're not moving the needle for AI.

How to implement this without overthinking it

Use JSON-LD format. It goes in a script tag in your page head, separate from your content. Easier to maintain, easier to debug, and both Google and AI systems prefer it.

Start with Article schema on all your content pages. Add FAQPage schema to any page with Q&A content. If you don't have FAQ sections, consider adding them just to have something to mark up.

Validate everything with Google's Rich Results Test before deploying. Schema with errors can be worse than no schema at all.

Update your dateModified when you actually modify content. I've seen sites automate this to update daily regardless of changes. Don't do that. AI systems are getting better at detecting freshness gaming.

What I'm less sure about

I can't tell if Organization schema helps establish credibility with AI systems or if I'm just seeing correlation with sites that are already credible.

I also don't know how much the actual implementation quality matters beyond "present and valid." Does better-structured JSON-LD perform better than minimal valid markup? The data is inconclusive.

What I do know: FAQPage schema works, it's easy to implement, and most sites don't have it. Low-hanging fruit.