Editorial source · measured July 2026
How ChatGPT uses pmc.ncbi.nlm.nih.gov to recommend products
pmc.ncbi.nlm.nih.gov is editorial — the kind of best-of article and buying guide ChatGPT leans on to build a shelf. We saw it cited 949 times across 10 of the 18 categories we measured.
- Citations
- 949
- Most-cited rank
- #52
- Categories
- 10 of 18
- Cited mostly as
- Other
Which shelves cite pmc.ncbi.nlm.nih.gov
The categories where ChatGPT pulled from this source when building a shopping answer. Broad reach means the model trusts it across the store, not just one aisle.
- Dog Supplements 391 citations
- Creatine 196 citations
- Electrolyte & Hydration Powders 178 citations
- Toothpaste 82 citations
- Clay Masks & Natural Skincare 47 citations
- Protein Powder 38 citations
- Sunscreen 8 citations
- Olive Oil 4 citations
- Lashes & Beauty Tools 3 citations
- Vitamin C Serums 2 citations
What ChatGPT cites it for
The kind of page ChatGPT pulled from this domain. Best-of lists dominate the shelf across the board — the model reaches for a ranked list far more than a comparison or a product page.
- Other 100%
How we measured this
- We asked ChatGPT brand-free shopping questions across 18 product categories and recorded every source URL it cited — 293,240 citations in all.
- This page counts how often pmc.ncbi.nlm.nih.gov showed up among them. Citation counts are for the public category studies only, not any private client work.
- A citation is ChatGPT surfacing the source. It is not an endorsement, a link, or traffic.
- One engine, one country, one point in time. The shelf, and who writes it, moves.
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