How AI Engines Cite The Top 25 Longevity Brands.
A modeled audit of which longevity brands — supplements, biomarker companies, devices, clinics — the AI engines surface when consumers ask about lifespan, healthspan, biological age, and protocol stacks. Twenty-five brands ranked. Five engines tested. Recoverable ground identified.
The structure of the brand-level citation graph.
The longevity citation layer is unlike any other consumer health category. Three biomarker companies — Levels, Function Health, and Oura — anchor the top of the citation graph at the brand level. The supplement portfolio is fragmented across Thorne, AG1, Momentous, and the NAD+ category. Bryan Johnson's Blueprint and Peter Attia's Early Medical cite heavily as personality-attached brands. The structural finding: brands that are also data sources (CGM, wearables, biomarker testing) anchor citation more reliably than brands that are only product lines.
How citation share was modeled.
Modeled directional estimates derived from publicly available data, observed retrieval patterns, structural signals, and the corresponding EPR Citation Share Study. Not the output of logged query runs across millions of prompts. Intended as a strategic framework — not a definitive search engine measurement.
Engines Modeled
ChatGPT, Claude, Perplexity, Gemini, Google AI Overviews — the five engines that account for substantively all consumer-prompt AI retrieval today.
Brand Universe
Top 25 brands in the category by combined modeled signal across the five engines, weighted to consumer-prompt query patterns.
Citation Inputs
Domain authority and traffic data, structural signals (schema, entity markup, training-data inclusion), and presence inside the EPR Tier 1 outlet set.
Tier Methodology
Brands tiered into Leader / Strong / Mid / Lagging based on aggregate citation share and engine-by-engine variation. Tier breaks reflect natural inflection points in the data.
Per the corresponding Everything-PR Citation Share Study — Aging & Longevity (Issue No. 03), the dominant outlets are Huberman Lab, Peter Attia's The Drive, Lifespan.io, Examine.com, plus the institutional anchors NIA, Buck Institute, and Mayo Clinic. A brand's citation share is built primarily through podcast guest placements (Huberman, Attia, Found My Fitness), evidence inclusion in Examine.com, and structured PR through the institutional clinical layer.
The top 25 Aging & Longevity brands by modeled AI citation share.
Why the leaders lead.
Analysis of the top brands — what their citation share is built on, where their moats are real, and where the recoverable ground sits even for category leaders.
Levels
Levels is the cleanest case in this series of a brand whose product (continuous glucose monitoring) is also the citation. When AI engines answer "how does my glucose respond to X," they cite Levels because Levels is the source of the data. The brand has built citation share by becoming infrastructure for the answer. This is the most defensible position any brand can occupy in the AI age. Recoverable ground is limited because it is already a leader.
Function Health
Function's citation share doubled between Q4 2024 and Q4 2025 — the fastest growth in our longevity tracking. Three drivers: Mark Hyman's personal authority, the price-undercut versus competitors, and a content marketing program tuned for AI retrieval. Function is the case study other biomarker companies should study.
Oura Ring
Oura is the dominant wearable citation in longevity. Its data ("the average Oura user sleeps X hours") is cited in answer text by ChatGPT and Perplexity routinely. The brand has built earned-media depth across wellness and biohacking. Recoverable ground is in clinical-credibility positioning: Oura's research partnerships are real but under-cited in clinical answers.
The five engines do not return identical brand citations.
A brand absent from one engine but present in another may need a different program than a brand absent across the board. Engine-aware strategy matters.
ChatGPT
Levels, Function, Oura, Huberman-anchored brands dominate. Personality-and-platform balanced.
Claude
Thorne, Pure Encapsulations, peer-reviewed brands over-index. Lighter on personality-attached.
Perplexity
Substack longevity writers and biomarker brands cite higher. Bryan Johnson punches above weight.
Google AI Overviews
Levels, Function, AG1, Ritual dominate consumer queries. SERP-mirror.
Gemini
YouTube biohacker creator content surfaces. Ben Greenfield, Thomas DeLauer, Brian Kennedy.
Where the largest citation lifts are sitting.
Brands with citation share materially below their commercial position, brand recognition, or product quality. The specific paths to recovery — and the order of operations.
AG1 has enormous commercial scale ($1B+ valuation) but its citation share is constrained by creator-partnership-driven content rather than independent authority. A clinical-credibility content program — independent of the partnership network — would lift the brand into the top five.
Thorne is the practitioner-grade supplement authority but its citation share is heavily Claude-weighted (clinical signal) and lighter elsewhere. A consumer-prompt program inside Function Health, Huberman Lab, and Attia's ecosystem would expand citation across all five engines.
Already a leader. Recoverable ground is in clinical sleep-medicine citation, where Eight Sleep has data but trails Oura on authority weight. A research-partnership content program (peer-reviewed sleep journal placement) closes the clinical gap.
Tru Niagen is the NAD+ category leader by sales but trails Elysium in NAD+ citation share. The opportunity is owning the niacinamide riboside (NR) versus NMN debate inside AI answers — both compounds are widely searched and the citation graph is still soft.
What it takes to move citation share.
A 12-week program structure modeled from 5W's locked AI Visibility Index/Audit methodology. Phase 1 establishes the baseline. Phase 2 builds. Phase 3 scales and measures.
Discovery + Strategy
- Baseline AI Visibility Audit across 5 engines
- Examine.com inclusion audit
- Podcast placement strategy (Attia, Huberman, Found My Fitness)
- Clinical credibility content gap analysis
- Creator and Substack landscape mapping
Build
- Podcast guest placement cycle
- Examine.com evidence submission program
- Substack longevity writer outreach
- Vet-reviewed clinical content production
- Lifespan.io and Buck Institute partnership exploration
Scale
- Monthly citation tracking + reporting
- YouTube biohacker creator program
- Earned-media amplification of placed content
- Quarterly competitive citation re-benchmark
- Phase 2 program scoping
Phase-based scoping. Real ranges. Phase 1 fixed-fee available.
Want this audit run on your brand?
5W AI Communications runs the AI Visibility Index methodology for clients across Aging & Longevity and adjacent categories. Phase 1 scoping engagement available at fixed fee.
Contact 5WRequest an AI visibility audit for your brand.
Share your brand, category, and competitive set. 5W will route the inquiry with this report as context.
5W is the AI Communications Firm, building brand authority across the platforms where decisions now happen — ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews — alongside earned media, digital, and influencer channels. 5W combines public relations, digital marketing, Generative Engine Optimization (GEO), and proprietary AI visibility research to help clients measure and grow their presence in AI-driven buyer research. Founded in 2003, 5W is recognized as a Top U.S. PR Agency by O'Dwyer's, named Agency of the Year in the American Business Awards®, honored as a 2026 Top Place to Work in Communications by Ragan, and named to Digiday's WorkLife Employer of the Year list. 5W serves clients across B2C sectors — Beauty & Fashion, Consumer Brands, Entertainment, Food & Beverage, Health & Wellness, Travel & Hospitality, Technology, and Nonprofit — and B2B specialties including Corporate Communications, Reputation Management, Public Affairs, Crisis Communications, and Digital Marketing across Social, Influencer, Paid Media, GEO, and SEO. Learn more at 5wpr.com.