#1
of 73 stores measured
The index › the United States › Supplements and health › Costco
Costco in the Krillo Index
When shoppers in the United States ask ChatGPT and Gemini where to buy supplements and health, is Costco named? This is the answer from our latest monthly measurement, November 2026.
23/35
buying questions where AI names it; the category median is 0
12
questions where AI recommends it outright
Measured with ChatGPT and Gemini, the same questions for every store in this category, asked in the language of the market. Read how we measure.
Around Costco
See the full ranking for Supplements and healthWhat AI says about Costco
In the 34 answers that name Costco, AI mentions: trusted (7x), low prices (4x), quality (4x), service and advice (1x), fast delivery (1x).
“| ### My practical recommendation - Budget / bulk whey: Costco or Walmart - Reliable variety: iHerb - Best quality-control confidence: buy direct from the manufacturer - Convenience: Target or Amazon, with seller verification ### What...”
ChatGPT, asked: where is the best place to buy protein powder online in the US?
“(Note: You generally need a Costco membership, though some items are available to non-members with a small surcharge).”
Gemini, asked: where is the best place to buy protein powder online in the US?
“Costco.com, good value for common supplements, especially Kirkland Signature.”
ChatGPT, asked: which American website should I use to buy vitamins and supplements?
Quoted word for word from the answers in our measurement. What AI says about your store decides which buying questions it names you for.
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