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Flore is an American company that sequences your gut microbiome and manufactures a personalized probiotic formula based on the results. Rather than offering a catalog of existing blends, Flore builds each formula individually from the customer's own sequencing data.

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At a glance

About Flore

Founded
2018
Production location
Joliet, IL, United States
Formulas manufactured
40,000+
Sequencing scope
352 markers, 23,000+ microbes
Formula size
Typically 5 to 7 strains
Product format
Capsules or powder
Customer service hours
6am to 6pm PST, every day
Customer service phone
415-326-4743
Flore operates in the premium segment of the gut health market, positioning itself toward adults who have already tried conventional probiotics without satisfactory results and are looking for a data-driven alternative. The company's approach starts with an at-home gut sequencing test analyzed against 352 markers and more than 23,000 microbes, after which a formula of typically five to seven strains is manufactured in-house in Joliet, Illinois. Formulas can be updated as the customer's gut microbiome changes over time, making the program ongoing rather than one-off. The underlying science has been published in the peer-reviewed journal mSystems, published by the American Society for Microbiology, and the company has received a research grant from The Brain Foundation for work on the gut-brain axis.
September 2026

Active promotions

Ready to use with your order at Flore.

Free gut microbiome app available without purchase, giving users access to gut health insights before committing to a paid program.
To the shop
Six-month probiotic program available as a one-time payment with no automatic renewal, including the option to reformulate the personalized blend at any point during the subscription period.
To the shop
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Frequently asked questions

What others ask about Flore

Answers to the most common questions, based on search behaviour and our own research.

Is Flore a reliable company?

Flore has been active in gut health since 2018 and holds a 4.5-star rating on Trustpilot based on 326 verified reviews. The company's research has been published in the peer-reviewed journal mSystems and it has received a research grant from The Brain Foundation, which adds a degree of independent scientific credibility.

How does the Flore probiotic test work?

Customers order an at-home gut microbiome test kit, collect a sample, and send it to an accredited CLIA/CAP laboratory for sequencing. The results are read against 352 markers and more than 23,000 microbes, and a personalized formula is then manufactured based on those findings.

Can I update my formula if my gut changes?

Yes. Flore's program is designed to be ongoing: customers track how they feel and the formula can be updated as the gut microbiome changes over time. The six-month program includes the option to reformulate at any point.

How can I contact Flore's customer service?

Flore can be reached by phone at 415-326-4743, seven days a week between 6am and 6pm Pacific Standard Time.

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