Research · The ChatGPT Supplement Index
Which supplement brands ChatGPT recommends
Shoppers ask ChatGPT which supplement to buy, and it answers with three or four brands. I asked five common supplement questions, three times each, to see who gets named and what gets a brand on the list.
By Monica Hacker, fractional CMO · Updated October 28, 2026 · 15 ChatGPT answers
The numbers
What 15 answers showed
answers named Nature Made, the most recommended brand in my tests.
answers used a third party seal, like USP, NSF or Informed Choice, as the reason to trust a pick.
"clean supplement" answers opened with the same five brands, in the same order.
Who got named
BrandAnswers naming it
- Nature Made9 of 15
- Thorne7 of 15
- Ritual5 of 15
- Momentous4 of 15
- Vital Proteins3 of 15
- Optimum Nutrition3 of 15
- Dymatize3 of 15
- Pure Encapsulations3 of 15
- Nordic Naturals3 of 15
- NOW Foods3 of 15
What stood out
A seal is the price of entry
Every answer leaned on independent testing. USP Verified, NSF Certified for Sport and Informed Choice came up again and again as the reason a brand made the list.
Clean is a closed list
All three clean supplement answers opened with Thorne, Pure Encapsulations, Nordic Naturals, Nature Made and NOW Foods. In my skincare tests, clean was the open lane. In supplements, it is the most locked question I asked.
Collagen is where the top spot moves
Vital Proteins was the first pick in two collagen answers. In the third, BUBS Naturals took the top spot. It was the only question where the number one brand changed.
Editorial testing feeds the answer
All three protein answers cited WIRED’s 2026 protein powder testing, and all three put Optimum Nutrition first. The brands that win the review roundups win the ChatGPT answer.
Is ChatGPT recommending your supplement brand?
Book a call →The questions I asked
Five questions, three runs each
Best magnesium supplement brand
Best multivitamin brand for women
Best collagen supplement brand
Best protein powder brand
Best clean supplement brands
What I'd fix first
Get one product certified, then make sure the internet knows it.
The brands ChatGPT names have a seal it can point to. Start with your hero product, get it third party certified, and put the seal, the dose and the test results on the product page in plain text, not just in an image.
Then get that same story into the places ChatGPT reads: retailer listings, review roundups and the certifier’s own database. Read the playbook: how to get ChatGPT to recommend your brand.
Is ChatGPT recommending your supplement,
or the one next to it on the shelf?
Let's find out.
My AI Visibility Check tests the questions your customers ask, shows who gets recommended instead of you, and gives you a prioritized fix list. $2,500, done in 5 days.
Book a call →Or see how I work with supplement brands.
Monica Hacker, fractional CMO for CPG, ecommerce, beauty and wellness, and healthcare brands. I run these tests myself and rerun them every month.
Questions people ask me
Which supplement brand does ChatGPT recommend most?
In my October 2026 tests, Nature Made was named in 9 of 15 answers, followed by Thorne in 7.
How does ChatGPT decide which supplement brands to recommend?
In my tests it leaned on third party certification, like USP Verified, NSF Certified for Sport and Informed Choice, plus editorial reviews such as WIRED’s protein powder testing.
Can a new supplement brand get recommended by ChatGPT?
It is harder than in skincare. Clean supplement answers named the same five brands all three times. Collagen was the most open question, where the top pick changed between runs.
How was the ChatGPT Supplement Index tested?
Five shopper style questions, each asked three times in fresh ChatGPT temporary chats with no memory or history. I count how often each brand is named.
Want to know where your supplement brand stands in ChatGPT?
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