ARC INDEX · SUPPLEMENTS
Vital Proteins
WHAT GROK TOLD A SHOPPER
One AI model's read-back recommended this.
Checked 8 Oct 2026. One AI model's read-back (currently Grok via API, not the consumer Grok app). One model, not a consensus.
Tested product: Salted Caramel Collagen Peptides. Product page · Store
Score
83
of 100 · 4 of 5 shoppers added to cart
Browser shoppers
4 of 5
Browser cart shoppers that added the product to the cart. The score is this lane. The catalog check does not change it.
Tested 6 Oct 2026. How ARC tests
CAN AGENTS BUY
The store answers Shopify's agent catalog, but a search did not return this product. 4 of 5 browser cart shoppers added the product to the cart. The rest get stuck at adding the product to the cart.
AGENT CATALOG · REAL
Catalog answered. A search did not return the tested product.
ARC BROWSER CART TESTS
4 of 5 added the product to the cart. Stuck at adding the product to the cart.
The catalog tool answered, but it did not return this product. Publish the product on the sales channel that feeds the agent catalog, and confirm a search for its name returns the same product URL.
View or refresh the free agent checkout check for vitalproteins.com →
GROK · REAL MODEL
One AI model's read-back recommended this.
Checked 8 Oct 2026. One AI model's read-back (currently Grok via API, not the consumer Grok app). One model, not a consensus.
Model x-ai/grok-4.20
Recommend this for quality and flavor if budget allows. Rivals like Sports Research or Orgain provide similar benefits at lower prices.
Rivals one model named: Sports Research, Orgain, Ancient Nutrition
MOST COSTLY MISMATCH
One AI model's read-back says your shipping cost is free over $50. Your site says free.
| Fact | Check | The model said | Store page |
|---|---|---|---|
| Shipping cost | Mismatch | free over $50 | freePolicy pageCode:GUMMIES25 Stay Vital Free Shipping on Subscription Orders *Packaging may vary Collagen Peptides Advanced with Hyaluronic Acid & Vitamin C $29 33oz with HA + Vitamin C $29 99 13 / serving 20oz with HA + Vitamin C $49 99 28 / serving…Source page |
| Price | Grok didn't know | — | — |
| Returns window | Grok didn't know | — | — |
| Availability | Match | in stock | in stock in 2 of 2 sizesschema.org JSON-LD"availability": "https://schema.org/InStock"Source page |
| Delivery estimate | Grok didn't know | — | — |
Sources Grok cited
- Vital Proteins Salted Caramel Collagen Peptides
- Vital Proteins Collagen Peptides
- Buy Collagen Protein Powder & Collagen Supplements
- Subscription Program Terms & Conditions | Vital Proteins
- Buy Collagen Protein Powder & Collagen Supplements | Vital Proteins
- Shop Products – Buy Collagen Protein Powder & Collagen Supplements | Vital Proteins
Each shopper
- ARC browser shopper BAdded to cart
- ARC browser shopper AAdded to cart
- ARC browser shopper CAdded to cart
- ARC browser shopper DAdded to cart
- ARC browser shopper EStopped
The failure
Couldn't add it to the cart
This stopped 1 of 5 agents.
Top fix
Use a real Add to cart button, and show that the item landed in the cart.
History
- 6 Oct 202683/100 · browser 4 of 5 · Couldn't add it to the cart
- 5 Oct 202683/100 · browser 4 of 5 · Couldn't add it to the cart
Is this your store?
The free scan puts the score on screen and emails the full report.
Share this result
Every ARC page and dataset is free to read, cite and reuse.
OpenClaw only follows labelled controls. A block at the door is one result for all five, with the HTTP evidence. The score is the ARC browser cart, the same number as a free scan. The agent-catalog check above is real and leads the buy verdict. It does not change the score. How it works.
BADGE FOR YOUR SITE
Put this on your site. It links back here. It says Agent checkout when the real catalog check returned a checkout link, and Agents chose us only when a browser cart shopper added the product to the cart.
<a href="https://www.arcreport.ai/agent-index/vital-proteins"><img src="https://www.arcreport.ai/agent-index/vital-proteins/badge" width="360" height="72" alt="Vital Proteins on the ARC Index. Agents chose us. ARC score 83. The store answers Shopify's agent catalog, but a search did not return this product. 4 of 5 browser cart shoppers added the product to the cart. The rest get stuck at adding the product to the cart."></a>
Want a re-test, or this page removed? Contact ARC or email hello@arcreport.ai.