- Visibility17
- Citations1
- Sentiment88
- Site quality80
- AI readiness57
AI assistants name Vitacost in 13.3% of answers, which is more often than the typical company in retail at 6.7%. Vitacost's overall score is 42 out of 100, ranking 257th of 2,047 overall and 68th of 640 among retail companies. Its website passes 8 of 14 technical checks for readiness with AI tools.
We asked 15 unbranded questions about the retail market: none named Vitacost. AI assistants named it in 8 of 60 answers (13.3%). The typical retail company is named in 6.7% of answers. By how often it is named, Vitacost ranks 213 of 640 in its sector.
Every dot is a company in the study. Hover one to see it; click to open its report.
This companySame sectorEvery other companyNever named
Five parts, each scored out of 100.
How often AI assistants name the company
How often AI uses the company's own website as a source
How positively AI describes the company
How well built the website's own pages are
How easily AI tools can read and use the website
Visibility is calculated from the answers on this page. How the score is built.
640 companies in this sector. The line on each bar is the typical company.
An answer that names the company
“What are the best online stores for buying vitamins and supplements in the US?”
Here are the best online stores to buy vitamins and supplements in the U.S., with a short note on what each is best for and one key thing to check before you buy.
Top picks
Amazon — Best for huge selection and fast shipping (especially if you already use Prime). Beware of third‑party sellers and check seller info and reviews; prefer listings sold by the brand or Amazon itself. (verywellfit.com)
iHerb — Great selection of mainstream and international brands, frequent discounts, and wide shipping options. Often a …
The AI’s answer as we received it, shortened and not checked for accuracy.
How the mentions in these answers were split between this company and its rivals
Answers naming it, out of answers received
What this website publishes for an AI agent to read, use and buy from, on a scale of six levels.
- 0
- 1
- 2
- 3
- 4
- 5
Level 0: Not yet agent-ready. Agents struggle to find basic information about the site.
- 2 of robots.txt, Sitemap, Link headers
Yes. Vitacost publishes a UCP profile, a file that tells an AI agent how to buy, and it includes checkout.
- UCPPublished
- ACPNot present
- AP2Not present
- x402Not present
- MPPNot present
The page also offers an agent tools inside the browser: add to cart, proceed to checkout, update cart lines.
The shop runs on Shopify.
Show every check, for your technical teamHide the checks
- study: 92.0%robots.txtNot met
Publish a valid robots.txt with crawl rules and a Sitemap line.
- study: 86.8%SitemapPartly met
Serve an XML sitemap and reference it from robots.txt.
- study: 0.3%Link headersNot met
Send Link headers such as rel="api-catalog" or rel="describedby" on the homepage.
- study: 5.5%DNS for AI DiscoveryNot present
Advertise agent endpoints with SVCB records under _agents.
- study: 1.9%Markdown negotiationNot met
Return a markdown version when asked with Accept: text/markdown, for example at the CDN.
- study: 25.1%llms.txtPassed
An llms.txt that tells language models what the site offers.
- study: 93.4%AI bot rulesPartly met
Add explicit robots.txt groups for the main AI crawlers.
- study: 1.4%Content SignalsNot met
Add a Content-Signal line for search, ai-input and ai-train to robots.txt.
- study: 0.2%Web Bot AuthNot present
Only relevant if you run your own agents or crawlers: publish a signing key directory.
- study: 0.3%API CatalogNot met
List public APIs in a linkset at /.well-known/api-catalog.
- study: 11.8%OAuth discoveryPassed
OpenID Connect or OAuth metadata agents can use to sign in.
- study: 10.3%OAuth Protected ResourcePassed
Metadata telling agents which authorization server to use.
- study: 0.0%auth.mdNot met
Publish an auth.md describing how agents sign in.
- study: 0.2%MCP Server CardNot met
Offer an MCP server and publish its server card under /.well-known.
- study: 0.1%A2A Agent CardNot met
Publish an agent card at /.well-known/agent-card.json.
- study: 0.2%Agent SkillsNot met
Publish a skills index with the main tasks agents can do.
- study: 33.7%WebMCPPassed
Tools registered in the browser through navigator.modelContext.
- study: 0.1%ARD manifestNot met
Publish an ai-catalog.json listing every agent interface.
Score 34 of 100 · 100% of checks could run · checked on October 5, 2026 · www.vitacost.com · 2,047 companies scanned
8 of 14 passed. This list is for your technical team. The percentage is how many companies in the study pass each check.
These 14 checks ran during the audit and are what the AI readiness part of the overall score counts. The scan above ran later and is stricter on Link headers and Markdown, so a check can pass here and not there.
Show the 14 checksHide them
- Not metrobots.txt publishedstudy: 85.0%
- PassedXML sitemapstudy: 73.2%
- PassedHTTP Link headers (RFC 8288)study: 29.0%
- PassedMarkdown content negotiationstudy: 8.3%
- Passedllms.txt publishedstudy: 21.7%
- PassedToken budget (page weight)study: 95.2%
- Not metExplicit AI bot rulesstudy: 13.0%
- Not metAPI Catalog (.well-known/api-catalog)study: 0.2%
- PassedOAuth Authorization Server discoverystudy: 10.1%
- PassedOAuth Protected Resource discoverystudy: 9.3%
- Not metMCP Server Cardstudy: 0.0%
- Not metA2A Agent Cardstudy: 0.0%
- PassedWebMCP toolsstudy: 4.2%
- Not metAgent Skills declaredstudy: 0.0%
How many times each website was listed as a source in these answers
In the study as Consumer brands.
- What are the best online stores for buying vitamins and supplements in the US?
- Is it worth purchasing eco-friendly home care products from online wellness retailers?
- What are some good alternatives to shopping for nutrition supplements online?
- Online supplement stores vs local health food stores—what are the pros and cons?
- What other ways can I source eco-friendly cleaning supplies besides using an online health marketplace?
- How can I find affordable wellness essentials online without sacrificing quality?
- Where else can I buy clean beauty products if I don't want to order from online wellness retailers?
- What is the typical price range for plant-based protein powders from online health shops?
- How can I tell if vitamins I bought online are authentic and safe to use?
- Should I buy personal care items from online health shops or stick to big box stores?
- Where can pet owners buy healthy treats and supplements for dogs and cats online?
- Why is my order for dietary supplements taking longer than expected to ship from an online retailer?
- How does buying sports nutrition products online compare to purchasing in specialty retail stores?
- Where can I find a wide selection of organic and non-GMO groceries online?
- What are the best online options for families looking for natural products for babies and kids?
Columns, left to right: OpenAI, Claude, Perplexity, Gemini. The AI assistants often disagree. Across the study, on 40% of the questions where a company is named, only one of the four names it.
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<a href="https://aeo-audit.rezolve.com/us/vitacost.com"><img src="https://aeo-audit.rezolve.com/us/badges/vitacost.com.svg" alt="Overall score 42 of 100, US AI Visibility Study 2026" width="280" height="64"></a>