Luxury Skin Care Brands: AI Market Discovery Index

Benchmark Summary

September 2026 was a quiet month for the Luxury Skin Care Brands benchmark, with no brand moving beyond normal month-to-month variation. Augustinus Bader remained the category leader in valid recommendation coverage at 45.8% in September 2026, up from 45.2% in August 2026. The gap to the next closest brand, La Mer, was 7.8 percentage points in September 2026.

The largest coverage decline was SkinCeuticals, falling 3.6 points from 39.0% to 35.4%. The largest coverage increase was Dr. Barbara Sturm, rising from 9.0% in August 2026 to 10.9% in September 2026, a gain of 1.9 percentage points.

Other brands also moved within normal variation: La Mer declined 2.2 points, Sisley Paris declined 1.5 points, SK-II rose 1.5 points, Clé de Peau Beauté rose 1.2 points, La Prairie declined 0.9 points, Tata Harper declined 0.7 points, and Guerlain held steady at 5.0% in both months.

The benchmark began with 800 prompt-surface observations in each month and produced 576 qualified observations in September 2026 and 597 in August 2026 after qualification.

Current Benchmark at a Glance

Qualified surface breadth refers to the number of canonical AI surface families (ChatGPT, Copilot, Gemini, Perplexity, AI Overviews, and AI Mode) with at least one qualified observation. Both months recorded all six families.

For the strategic interpretation of this benchmark, read CiteWorks Studio's analysis of How AI Search Is Recommending Luxury Skin Care Brands

Research Scope and Qualification

The public benchmark is narrower than the raw collection universe by design. Brand-level percentages use the qualified observations as the public denominator, not the raw collection.

Current Brand Standings

The standings below use the 576 qualified observations from September 2026 as the denominator for every rate in this table.

How to Read the Standings

• Presence rate is the share of qualified observations where the brand is mentioned at all.
• Valid recommendation coverage is the share of qualified observations where the brand appears in a valid recommendation shortlist.
• Top-three rate is the share of qualified observations where the brand appears among the top three recommendations.
• Rank-one rate is the share of qualified observations where the brand is the first recommendation.
• Net sentiment is the balance of positive over negative mentions, scored from -1 to +1.

For formulas and denominator rules, see AI Market Discovery Metric Definitions.

Recommendation Coverage Movement

September 2026 showed no movement beyond normal month-to-month variation for any tracked brand. All ten brands are classified as stable. While SkinCeuticals recorded the largest absolute decline (3.6 points) and Dr. Barbara Sturm the largest gain (1.9 points), each move sits within the expected variation for this category and does not yet constitute a trend.

Category Leader: Augustinus Bader

Augustinus Bader held the leading valid recommendation coverage position in September 2026 at 45.8%, up from 45.2% in August 2026. The brand also led on top-three rate (33.0% in September 2026, up from 30.8% in August 2026) and delivered the highest rank-one rate at 15.8% in September 2026, up from 13.1% in August 2026. These gains were paired with presence of 72.2% and net sentiment of 0.8.

Recommendation Placement Snapshot

Coverage alone does not show how prominently a brand is recommended. The leading brands show differing relationships between top-three and rank-one placement. In September 2026, Augustinus Bader held a 33.0% top-three rate and a 15.8% rank-one rate. La Mer held a 28.0% top-three rate and a 12.2% rank-one rate. SkinCeuticals held a 23.3% top-three rate and a 7.3% rank-one rate.

Similar coverage can still hide different first-position rates: La Mer closed the top-three gap with SkinCeuticals while its rank-one rate declined in the same period.

Buyer-Intent Distribution

All qualified observations in both months fell into the Brand Recommendation class, representing discovery and consideration queries.

The current public series measures brand-recommendation discovery and does not yet contain qualified observations in the pricing or comparison classes for either month.

Historical Measurement Record

This is an evergreen benchmark URL. New measurements are added to the same report.

Evidence and Source Layer

The benchmark is built from prompt-level observations that retain the query, AI/search surface, answer, brand outcome, recommendation placement, sentiment, and, where exposed, citations or attributable evidence sources. Source presence is evidence about the information environment. It is not automatically proof that the source caused the recommendation.

Scope Boundaries

This public benchmark does not measure market share, attributable sales, every possible AI response, organic-search ranking, social mention volume, private or sponsored channels, or causality from a metric movement alone.

About This Benchmark

The LLM Authority Index AI Market Discovery Index tracks how AI-driven discovery surfaces present brands across canonical AI and search experiences. The Luxury Skin Care Brands vertical covers ten brands measured across six AI surface families each month.

• AI Market Discovery Methodology
• AI Market Discovery Metric Definitions
• AI Market Discovery Research Standards
• Modeled AI Authority Value

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