Patients & Caregivers

Our Message to Patients

At Kaleido, we are relentless in our drive to pursue rigorous science and pioneer new approaches that can transform lives. The microbiome remains a largely untapped frontier in healthcare, with a broad and growing body of research implicating it in a number of diseases and conditions. We are uniquely positioned to succeed in translating its promise into solutions for patients and caregivers. Our team is hard at work developing our Microbiome Metabolic Therapies (MMT™), which we believe have potential to be therapies across a variety of conditions. Our initial areas of focus are in diseases resulting in hyperammonemia, infections caused by multi-drug resistant bacteria, cardiovascular disease and chronic kidney disease. We invite you to learn more about our programs and clinical studies and how patients are at the heart of everything we do towards our mission of leading a revolution in human health.

Alison Lawton
President & CEO

Our Clinical Studies

We have built a human-centric proprietary product platform for discovery and development that we believe will enable the rapid advancement of a broad portfolio of novel product candidates into human clinical studies under regulations supporting research with food. In these clinical studies, we are able to evaluate safety and tolerability and potential markers of effect, which allows us to assess the overall promise of our MMT candidates. If after completing clinical studies under regulations supporting research with food we decide to pursue an MMT candidate as an investigational drug product, we will conduct clinical trials under an IND, or the regulatory equivalent outside the U.S., to evaluate its safety and effectiveness as a therapeutic in patients.

Phase 2 clinical trial of KB195 in patients with urea cycle disorders/UNLOCKED (NCT03933410)

Urea cycle disorders (UCD) are a group of life-threatening, rare genetic diseases caused by a deficiency in one of the six enzymes or two amino acid transporters that constitute the urea cycle, resulting in an impaired ability to process ammonia.

This Phase 2 clinical trial is enrolling UCD patients with inadequate control of their disease (defined as having elevated ammonia) on standard of care and will assess the effect of KB195 on reducing plasma ammonia levels and evaluate its safety and tolerability.

Clinical study evaluating KB195 in patients with urea cycle disorders (NCT3797131)*

This clinical study is designed to evaluate the safety and tolerability of KB195 in patients with UCD, as well as its effect on ammonia levels as measured by nitrogen metabolism in blood and urine.

Clinical study evaluating KB174 in patients with well-compensated cirrhosis (NCT03855956)*

Hepatic encephalopathy describes a spectrum of potentially reversible neurologic and psychiatric abnormalities generally seen in patients with liver failure. It is a common complication of all forms of cirrhosis, leading to significant morbidity and mortality in this patient population. Elevated ammonia in the blood is central to the pathologic process that causes encephalopathy.

This randomized, double-blind, controlled clinical study is designed to evaluate KB174 compared to a negative control in adult patients with well-compensated cirrhosis. It will evaluate nitrogen metabolism in the blood and urine, as well as safety and tolerability.

Clinical study evaluating KB109 in patients colonized with multi-drug resistant (MDR) pathogens/VITORA (NCT03944369)*

MDR pathogens are a significant and growing global health threat. In the United States alone, at least two million people per year are infected with bacteria resistant to antibiotics. Colonization with MDR pathogens leads to a higher risk of serious infections. This clinical study will evaluate the safety and tolerability of KB109 compared to control, as well as change in colonization of Vancomycin-Resistant Enterococcus (VRE), Extended-Spectrum Beta Lactamase-Producing Enterobacteriaceae (ESBLs), and Carbapenem-Resistant Enterobacteriaceae (CRE).

Clinical study evaluating various doses of KB174 in healthy subjects*

This clinical study is designed to evaluate various dosing levels of KB174 in healthy subjects in a model designed to assess nitrogen metabolism. Following a protein challenge, markers of nitrogen metabolism in the blood and urine will be measured, and safety and tolerability will also be evaluated.

For additional information about Kaleido’s clinical studies, please visit or contact Kaleido at

*Human clinical study conducted under regulations supporting research with food.

Expanded Access Policy

Kaleido Biosciences is committed to developing new therapies for unmet medical needs. A key part of this development is testing our therapies in clinical trials to assess the safety and effectiveness of our investigational products in human subjects.

Expanded Access, sometimes called Compassionate Use, refers to a pathway in which patients with serious or immediately life-threatening diseases or conditions may gain access to an investigational product outside the context of participation in clinical trials when there are no comparable or satisfactory therapies available. For a sponsor to provide an investigational product as part of an Expanded Access Program is a complex matter and is different from studying the investigational product as part of a clinical trial, where more comprehensive safety and efficacy data are collected. We understand that under certain circumstances Expanded Access to our investigational products may be appropriate and may be considered.

Consistent with the Food and Drug Administration (FDA) and other regulatory agency guidelines regarding when Expanded Access may be considered, several factors are evaluated. Those factors include, but are not limited to:

  • The illness must be serious or life-threatening with no other satisfactory treatment options (such as the availability of approved therapies or enrolling clinical trials of investigational products)
  • There is sufficient evidence that the potential benefit to the patient would likely outweigh the potential risks, and those risks are not unreasonable in the context of the disease or condition being treated, based on available safety and efficacy information on the investigational product
  • The sponsor’s ability to provide a product in a fair and equitable manner, so that there is adequate manufacturing capacity for its ongoing clinical programs
  • Whether granting expanded access to certain patients would potentially compromise the scientific validity of broader development programs or interfere with or delay current clinical trials or regulatory filings designed to make the therapy available to many more patients

At this time, Kaleido believes that participation in one of our clinical trials is the most appropriate way to access our investigational products. If you or a family member are interested in potentially gaining access to one of our investigational products, we encourage you to consult with your physician regarding the possibility of participating in our planned clinical trials. If you have additional questions, please speak with your physician or contact us via email at We anticipate acknowledging receipt of such inquiries sent to this email within five business days. We continue to work to advance our development programs to deliver innovative products to the largest number of patients in the shortest amount of time.

1Please note that Kaleido assumes no responsibility for the information, statements or other content you may encounter on third-party websites