Beyond Healthline: 25 domains drive half of AI's supplement brand citations. Here's the outreach shopping list.

How citation share actually concentrates

Two domains drive 10% of all brand citations. Twenty-five drive half. Ninety-nine drive 80%. Past domain #100, marginal share drops below 0.4% per domain. This is the structural map any outreach plan should sit on.

The actionable read: 25 domains is a 6-month outreach roadmap with measurable AEO impact. Domains 26-99 is a 12-month roadmap. Past 99, ROI drops sharply because the average domain in that group contributes a single citation.

The top 5: not all created equal

The five biggest domains generate 31% of brand citations between them, and each one behaves differently. Treating them as a single tier is the first mistake we see in PR plans.

healthline.com (79 citations, all 5 platforms). The default cross-platform gatekeeper. Top URLs are evergreen “best of” pages: best prenatal vitamins (13 citations), best fish oil (11), best vitamin brands (11), best ashwagandha (6). One placement on an existing best-of list compounds across every AI engine.

fortune.com (70 citations, all 5 platforms). Driven entirely by the Fortune Recommends “best of” article cluster: best postnatal vitamins (8), best magnesium (7), best melatonin (7), best NMN (7), best prenatal (6). Different editorial team than the main Fortune newsroom, different pitch process. Treating it as one outreach target with the business desk is a wasted pitch.

consumerlab.com (56 citations, 4 platforms, zero ChatGPT). The strategic warning in the data. ConsumerLab's content is paywalled, and ChatGPT does not cite it at all. The lesson for any paid-subscription supplement publisher is direct: a paywall removes you from one of the largest AI engines. For brands, ConsumerLab placement counts on Claude, Gemini, Perplexity, and search SERPs, but does nothing for ChatGPT.

fda.gov (44 citations, all 5 platforms). Driven by negative queries: recall pages, warning letters, undeclared-ingredient alerts. Brands cannot pitch FDA, but they should monitor the recall pages AI engines pull from, because adjacent-cluster contamination is real and attached citations persist for years.

innerbody.com (43 citations, all 5 platforms). Innerbody dominates emerging categories where AI brand defaults have not yet calcified. Top URLs: best urolithin A (9 citations), best berberine (8), best NAD+ (7), best ashwagandha (5), best menopause (5). For any brand launching in NMN, NAD+, urolithin A, apigenin, or berberine, an Innerbody placement is closer to a category-defining outcome than a Healthline placement.

Mid-tier gatekeepers that most outreach plans miss

The interesting outreach targets sit between rank 8 and rank 25, where one well-placed article delivers more citation share than three Healthline mentions buried behind newer content.

eunatural.com (34 citations, single article). A single page, “Best supplement brands 2026”, on a brand-owned blog, drives 33 of 34 citations across 4 platforms. One article on a mid-tier authority outranks most major-publisher placements in raw citation share.

naturproscientific.com (33 citations, single article). The “bad-supplements-list” page is the negative-query gatekeeper. Every citation comes from that one URL. If your brand has no exposure on that list, AI's negative-query answers route around you. If your brand appears on it, you have a defensive content problem to solve immediately.

livemomentous.com (28 citations, 4 platforms). Momentous is a supplement brand. Their owned blog ranks as an authority source AI engines cite alongside publishers. Their berberine roundup drove 13 citations alone, nearly half the domain's total. The most replicable lever in the data: brand-owned category roundups with editorial depth can earn citation credit equivalent to a top-15 publisher.

omre.co (11 citations, all 5 platforms). Another brand-owned blog. Smaller volume than Momentous, but distributed across every AI engine. Their pages on best urolithin A (4 citations), best NMN (4), and best berberine for PCOS (2) cover the same emerging categories where Innerbody wins. Omre and Momentous together prove the brand-owned authority pattern is not a one-off.

supplementchecker.co (16 citations, ChatGPT only). ChatGPT is the single platform that treats supplementchecker.co as a trust-cert authority. Their “50 most trusted supplement brands” page (11 citations) and “best third-party tested supplements” page (5) are the two URLs ChatGPT relies on. If ChatGPT visibility is a brand priority, this is a separate, ChatGPT-specific outreach target.

factually.co (12 citations, ChatGPT and Claude only). A fact-check authority both ChatGPT and Claude cite on trust-cert and negative queries. Smaller volume, narrower footprint, but high relevance for any brand defending against negative coverage.

reddit.com (12 citations, 3 platforms, #22 by total citations). Reddit appeared 5x more often in our 47-prompt sample than in our earlier 15-prompt pilot, growing fastest of any source. Cited threads cluster in r/Supplements, r/glutenfree, r/A1HealthReviews, r/PeterAttia, r/pharmacy. Reddit is now a structural AI source for supplements, which means negative subreddit threads about a brand surface in responses for years.

youtube.com (13 citations, Perplexity only). Perplexity uniquely cites YouTube as a source for supplement queries. If Perplexity visibility is a priority, video review placement on top supplement reviewers is the addressable lever, and it is invisible to text-only outreach plans.

A 6-month outreach plan against the top 25

We treat the 25-domain list as a tiered roadmap, not a flat list. Tiering by platform breadth and category fit beats blanket pitching every time.

Months 1-2: cross-platform anchors. Pitch the 5-platform domains in this band: healthline.com, fortune.com, innerbody.com, medicalnewstoday.com (32 citations), bbcgoodfood.com for UK reach, halfmarathontrainingplan.com (10 citations, athlete-niche). Monitor fda.gov passively. One placement here moves citation share across every AI engine.

Months 3-4: category-fit mid-tier. Pitch the topical authorities matched to the brand's category. For mushrooms: thegoodtrade.com (22 citations, mushroom roundup drove 10). For sleep: sleepfoundation.org (11 citations). For postnatal: everydayhealth.com (20 citations, postnatal-specific). For athlete recovery: garagegymreviews.com (20 citations, gluten-free protein and pre-workout). For trade audience: supplysidesj.com (12 citations, Amazon brand analysis).

Months 5-6: platform-exclusive gatekeepers. Treat these as separate campaigns because each one targets exactly one AI engine. supplementchecker.co for ChatGPT. scienceinsights.org (10 citations, Claude only) for Claude. YouTube reviewer outreach for Perplexity. Reddit community-engagement programs (not paid placements) for the search-engine baseline and Gemini.

Skip below domain #100. The 124 long-tail domains beyond contribute single citations each, at the same pitch cost as tier-1 with roughly 1/30 the impact.

What this means for PR and outreach leads

Three strategic moves come out of this domain shape. Each one is independently testable.

Move 1: Reorganize outreach around tiered citation share, not publisher prestige. A pitch to Forbes (11 citations, 3 platforms) is roughly equivalent in citation outcome to a pitch to omre.co (11 citations, all 5 platforms), except the omre.co route is a brand-owned editorial collaboration most teams have never considered. Run the math by citation share, not media-list familiarity. The top 25 list is your six-month plan. Domains 26-99 is your second year. Past that, time is better spent on owned content.

Move 2: Build a brand-owned category roundup as a lever, not just a CTA destination. livemomentous.com (28 citations) and omre.co (11 citations across all 5 platforms) are both supplement brands ranking as authority sources because their roundup pages have editorial depth, named tests, and category breadth. The replication pattern is concrete: pick the emerging category your brand competes in (NMN, NAD+, urolithin A, apigenin, berberine, mushroom complex), write the most thorough best-of roundup in the category, include competitor brands honestly, and document explicit testing methodology, dosage breakdowns, and named third-party labs. Momentous's berberine roundup drove 13 of their 28 citations. The single page is the lever.

Move 3: Pursue platform-exclusive gatekeepers as separate campaigns. ChatGPT, Claude, and Perplexity visibility require different outreach lists. supplementchecker.co buys ChatGPT. scienceinsights.org buys Claude. YouTube reviewer placements buy Perplexity. Reddit community presence buys search SERPs and Gemini. Bundling them into one PR sprint dilutes each. Run them as four distinct campaigns with four distinct success metrics.