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ClostraBio is built and backed by heavyweight ecosystem players in Chicago.
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Our technology was spun out of labs at the University of Chicago, and we are members of Portal Innovations, a premier venture development engine focused on early-stage life science enterprises.
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Unmet Need and Solutions
ClostraBio was founded based on work out of the University of Chicago, a world-leading academic institution. With an interest in the microbiome and its relationship to food allergy and other intestinal disorders, University of Chicago researchers demonstrated that short-chain fatty acids (SCFAs) derived from commensal bacteria, particularly butyrate, are promising therapeutic candidates because of their critical roles in maintaining epithelial barrier function and inducing gut-resident Tregs. As endogenous gut components, SCFAs are also generally regarded as safe (GRAS).
However, oral delivery of butyrate to the small intestine and colon has been a challenge because even with enteric coating or encapsulation, it possesses a foul odor and taste, is not absorbed in the part of the gut where it can have a therapeutic effect, and is metabolized too rapidly to maintain a pharmacologic effect.
To date, success with oral butyrate has been limited, and delivery via enema, while effective, is not an acceptable route of administration for daily management of gut health issues, or treatment of IBD or food allergy. Additionally, harnessing any bacterial metabolite as a therapeutic without modification also creates challenges for patenting and obtaining exclusivity.
ClostraBio has solved these problems using two novel approaches:
Regarding the latter solution, ClostraBio's co-founder developed polymers that self-assemble into micelles to protect and stabilize butyrate, which is released enzymatically. These polymers, known as CLB-004, have demonstrated controlled, extended release of butyrate in the ileum, cecum and colon in vivo: exactly where commensal bacteria produce butyrate in healthy individuals.
ClostraBio was founded based on work out of the University of Chicago, a world-leading academic institution. With an interest in the microbiome and its relationship to food allergy and other intestinal disorders, University of Chicago researchers demonstrated that short-chain fatty acids (SCFAs) derived from commensal bacteria, particularly butyrate, are promising therapeutic candidates because of their critical roles in maintaining epithelial barrier function and inducing gut-resident Tregs. As endogenous gut components, SCFAs are also generally regarded as safe (GRAS).
However, oral delivery of butyrate to the small intestine and colon has been a challenge because even with enteric coating or encapsulation, it possesses a foul odor and taste, is not absorbed in the part of the gut where it can have a therapeutic effect, and is metabolized too rapidly to maintain a pharmacologic effect.
To date, success with oral butyrate has been limited, and delivery via enema, while effective, is not an acceptable route of administration for daily management of gut health issues, or treatment of IBD or food allergy. Additionally, harnessing any bacterial metabolite as a therapeutic without modification also creates challenges for patenting and obtaining exclusivity.
ClostraBio has solved these problems using two novel approaches:
- through discovery and development of a next-generation butyrate-producing probiotic, CLB101™, as a dietary supplement, and
- by creating block copolymers that deliver butyrate directly to the lower gut.
Regarding the latter solution, ClostraBio's co-founder developed polymers that self-assemble into micelles to protect and stabilize butyrate, which is released enzymatically. These polymers, known as CLB-004, have demonstrated controlled, extended release of butyrate in the ileum, cecum and colon in vivo: exactly where commensal bacteria produce butyrate in healthy individuals.
Next-Generation Probiotic Overview
ClostraBio is developing a unique probiotic called CLB101™ as a dietary supplement for various applications related to maintaining and promoting gut health. A strict anaerobe isolated from a healthy human, CLB101™ has been identified as a strain critical to gut health through its direct production of butyrate in targeted areas of the lower intestine. Butyrate is widely known as a key molecule to support gut health, and its mechanisms of action include strengthening intestinal barrier integrity, providing immune support, and promoting a diverse microbiome.
CLB101™ has been granted self-affirmed GRAS (Generally Recognized as Safe) status by a panel of scientific experts. The GRAS designation follows rigorous review of safety data, including genomic characterization, multiple toxicology studies, and a demonstrated manufacturing process with stringent quality control.
CLB101™ was launched as a probiotic supplement in Fall 2025, through both direct and partnered distribution channels, including a strategic collaboration with a leading healthcare practitioner-focused supplement brand.
ClostraBio is developing a unique probiotic called CLB101™ as a dietary supplement for various applications related to maintaining and promoting gut health. A strict anaerobe isolated from a healthy human, CLB101™ has been identified as a strain critical to gut health through its direct production of butyrate in targeted areas of the lower intestine. Butyrate is widely known as a key molecule to support gut health, and its mechanisms of action include strengthening intestinal barrier integrity, providing immune support, and promoting a diverse microbiome.
CLB101™ has been granted self-affirmed GRAS (Generally Recognized as Safe) status by a panel of scientific experts. The GRAS designation follows rigorous review of safety data, including genomic characterization, multiple toxicology studies, and a demonstrated manufacturing process with stringent quality control.
CLB101™ was launched as a probiotic supplement in Fall 2025, through both direct and partnered distribution channels, including a strategic collaboration with a leading healthcare practitioner-focused supplement brand.
Butyrate Prodrug Product Development Overview
ClostraBio has completed numerous supportive nonclinical studies to validate our CLB-004 program. The company has transferred our manufacturing process to a CDMO where we've successfully manufactured multiple kg-scale batches of material for nonclinical studies.
With IND-enabling toxicology studies underway, we expect to initiate clinical studies in the near future. Given the expected favorable safety profile of our compounds, we intend to enroll patients with mild-moderate ulcerative colitis (UC) as part of a Phase 1a/b SAD-MAD clinical study to obtain safety/tolerability data. ClostraBio is actively seeking further investment to complete IND-enabling activities and conduct the Phase 1a/b clinical study.
ClostraBio has completed numerous supportive nonclinical studies to validate our CLB-004 program. The company has transferred our manufacturing process to a CDMO where we've successfully manufactured multiple kg-scale batches of material for nonclinical studies.
With IND-enabling toxicology studies underway, we expect to initiate clinical studies in the near future. Given the expected favorable safety profile of our compounds, we intend to enroll patients with mild-moderate ulcerative colitis (UC) as part of a Phase 1a/b SAD-MAD clinical study to obtain safety/tolerability data. ClostraBio is actively seeking further investment to complete IND-enabling activities and conduct the Phase 1a/b clinical study.
Polymeric Nanoparticle Prodrug Platform
ClostraBio has demonstrated our plug-n-play platform can be utilized to formulate multiple small molecule prodrugs for targeted delivery and sustained release in the lower gut. In addition to CLB-004 polymers, our chemists have synthesized SCFA, non-SCFA bacterial metabolite, and other small molecule polymer nanoparticles that hold promise as potential treatments for various autoimmune, metabolic and neurological indications.
If your drug development team is interested in learning more about our platform and potential collaboration opportunities, please reach out to our business development team via the CONTACT page.
ClostraBio has demonstrated our plug-n-play platform can be utilized to formulate multiple small molecule prodrugs for targeted delivery and sustained release in the lower gut. In addition to CLB-004 polymers, our chemists have synthesized SCFA, non-SCFA bacterial metabolite, and other small molecule polymer nanoparticles that hold promise as potential treatments for various autoimmune, metabolic and neurological indications.
If your drug development team is interested in learning more about our platform and potential collaboration opportunities, please reach out to our business development team via the CONTACT page.
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ClostraBio offers the following:
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A plug-n-play nanoparticle drug delivery platform: with demonstrated delivery of multiple effector molecules including short-chain fatty acids, other bacterial metabolites and small molecules.
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An opportunity to target the underlying condition(s): modulating barrier function and immune response without suppression of immunity.
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A first-in-class, next-generation probiotic strain backed by strong science and GRAS self-affirmation.
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A well-rounded team of highly respected scientists, serial entrepreneurs and experienced product developers.
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A focus on restoration of intestinal barrier-protective function and innate immunity to promote gut health, and directly treat IBD and food allergy.
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