810 million users. And your brand isn't mentioned in a single response.

AI search engines like ChatGPT, Gemini, and Perplexity have transformed the search behavior of millions of consumers—quietly, rapidly, and with far-reaching consequences for CHC brands.

The change didn’t come with a press release. It came with a new habit. Today, millions of consumers no longer open a search engine when they have a health-related question—they ask ChatGPT, Perplexity, or Google AI Overview. The answer comes instantly, sounds authoritative, and they don’t click on anything else. That often concludes their research—before they’ve even visited a single website.

For marketing teams in the consumer healthcare sector, this means that a key part of the purchasing decision-making process takes place in a channel that very few have systematically monitored—let alone actively shaped—until now. This is no longer a marginal phenomenon. It is the new normal.

The End of Traditional SEO Thinking

For years, the logic was: a #1 ranking on Google equals visibility equals revenue. This equation still holds true—but it applies to a shrinking portion of the search landscape. Today, around 93% of all AI search sessions end without a single website click. The answer is consumed directly within the AI interface; the search is complete before the user has even seen a website.

Google AI Overviews are now present in over 25% of all Google search queries (as of March 2026, analysis of 21.9 million queries). And they are drastically changing click behavior: AI Overviews reduce the click-through rate to the top-ranked organic page by 58%. Anyone who doesn’t appear in these AI-generated summaries loses visibility—regardless of how much budget has been invested in traditional SEO measures.

“If you don’t show up in AI-generated results, you simply don’t exist for millions of customers—no matter how high your Google ranking is.”

OTC-CUBE BRANDTELLIGENCE

Quotes are the new currency of authority

So what determines whether a brand appears in AI-generated answers? For the first time, we have reliable data. A study by SE Ranking analyzed 2.3 million websites and identified the strongest factors influencing AI citations. The result is clear: domain traffic is the most important single factor. Pages with high traffic receive three times as many mentions in AI-generated answers as less-visited pages.

For OTC and CHC brands, this has direct consequences: product pages, expert content, and pharmacy listings that aren’t regularly updated and don’t offer structured information are systematically overlooked by AI systems. Competitors who understand this connection and optimize their content accordingly gain lasting visibility—even without investing more budget in traditional advertising.

The underestimated complexity: Every AI platform evaluates differently

Anyone who believes that AI visibility is a uniform metric is significantly underestimating the new reality. New data from March 2026 reveals a surprising degree of fragmentation: the same brand can show a difference of up to 615-fold in citation frequency across different AI platforms—as measured between Grok and Claude.

ChatGPT, Gemini, Claude, Perplexity, and Grok each follow their own algorithms, weight sources differently, and have distinct sentiment profiles. What is considered a trustworthy source on one platform may be completely ignored on another. Additionally, AI visibility varies geographically by a factor of 2.8—particularly relevant for European CHC brands with a presence in multiple markets. And: Within just five weeks, brands can lose up to 36% of their AI visibility—without any visible external cause.

What traditional monitoring misses

• Citation volume varies by up to 615× across different AI platforms (Superlines, March 2026)

• AI visibility varies geographically by a factor of 2.8× – critical for Europe-wide brands

• In 5 weeks, brands can lose up to 36% of their AI visibility

• “Ghost Citations”: AI links to a website but does not mention the brand name – invisible in traditional monitoring

• Each platform has its own sentiment profile – positive on one, neutral or absent on another

The bottom line: Multi-platform tracking is no longer an optional add-on. It is a prerequisite for any company that wants to effectively manage its digital brand presence in 2026.