Black Licorice Compound Glycyrrhizin Shows Promise for Inflammatory Bowel Disease in New Stem Cell Study

Scientists have identified a natural compound found in black licorice that may help fight inflammatory bowel disease (IBD), a chronic condition that affects millions of people worldwide. The compound, called glycyrrhizin, was shown to reduce inflammation and prevent cell death in a new laboratory model of the human intestine built from stem cells.

Researchers at the University of Tokyo in Japan developed this innovative model to better understand how IBD damages the gut and to screen potential treatments. Their findings, published in the journal Stem Cell Reports, offer hope for the millions of patients who struggle with current therapies.

What Is Inflammatory Bowel Disease and Who Does It Affect?

Inflammatory bowel disease is a long-term condition that causes ongoing inflammation in the digestive tract. It includes two main forms: Crohn’s disease and ulcerative colitis. Both can be painful and disruptive.

Common symptoms include persistent diarrhea, severe abdominal pain and cramping, fatigue, unintended weight loss, and blood in the stool. For many people, these symptoms flare up without warning, making it hard to work, attend school, or enjoy daily activities.

According to researchers, about 4 million people around the world are living with IBD. That number continues to rise, especially in newly industrialized countries. In the United States alone, an estimated 1.6 million people have the condition, and rates are climbing among children and young adults.

IBD is different from irritable bowel syndrome (IBS), which is a functional disorder rather than an inflammatory disease. IBD causes visible damage to the intestinal lining, which can lead to serious complications such as strictures, fistulas, and an increased risk of colon cancer if left untreated.

Why Current Treatments Fall Short for Many Patients

Several types of treatment exist for IBD, including anti-inflammatory medications, immune-suppressing drugs, and biologic therapies that target specific proteins involved in inflammation. However, these treatments do not work for everyone.

Many patients find that their symptoms return even while taking medication. Others experience side effects such as nausea, increased infection risk, or liver problems. Some people eventually stop responding to a drug after months or years of use. Surgery to remove damaged portions of the intestine is sometimes necessary, but it is not a cure.

Experts say there is a clear need for new treatment options that are safer, more effective, and accessible to more patients. This is where the new stem cell research could make a difference.

How Scientists Built a Human Intestine Model Using Stem Cells

One major challenge in developing new IBD drugs has been finding a laboratory model that accurately mimics the human intestinal wall. Animal models do not always predict how a drug will behave in people. And traditional cell cultures often lack the complexity of real human tissue.

To solve this problem, a research team led by Yu Takahashi at the University of Tokyo created a human intestine model using stem cells. These stem cells were coaxed to grow into intestinal tissue that closely resembles the lining of the human gut.

Once the model was ready, the scientists triggered an IBD-like condition by exposing the tissue to a major inflammatory protein that is known to be elevated in patients with IBD. This protein causes inflammation and cell death in the intestines of people living with the disease.

The team confirmed that the protein caused similar damage in the lab-grown tissue. This gave them a reliable platform to test potential treatments.

Screening Thousands of Compounds Led to Black Licorice Ingredient

With the model established, the researchers screened about 3,500 different compounds to see which ones could protect the intestinal cells from damage. This process, called high-throughput screening, allows scientists to rapidly test many potential drugs at once.

Among the strongest performers was glycyrrhizin, a natural compound found in the root of the licorice plant and responsible for the sweet taste of black licorice candy. Earlier studies had already suggested that glycyrrhizin might help in cellular and animal models of IBD. This new research provided additional support for its potential benefits.

In the stem cell-derived intestinal model, glycyrrhizin significantly reduced intestinal cell death. The same effects were seen in mice with IBD, where the compound lowered inflammation levels and reduced damage to intestinal cells.

What This Means for People Living with IBD

For patients who have tried multiple treatments without lasting relief, these findings offer a glimmer of hope. Glycyrrhizin is a naturally occurring substance that has been used in traditional medicine for centuries, especially in Asia and Europe, for its anti-inflammatory and antiviral properties.

However, experts caution that eating large amounts of black licorice candy is not the same as taking a carefully measured medication. Black licorice contains other compounds that can cause side effects, especially when consumed in high quantities. For example, glycyrrhizin can cause potassium levels to drop dangerously low, leading to heart rhythm problems, high blood pressure, and even cardiac arrest in extreme cases. The FDA warns against eating more than two ounces of black licorice per day for two weeks or longer.

The researchers emphasize that their study is still in the early stages. While the stem cell model and mouse experiments are promising, additional clinical studies in humans are needed to determine whether glycyrrhizin can safely and effectively treat IBD without causing harmful side effects.

Expert Perspectives on Natural Compounds for IBD

Gastroenterologists and researchers generally agree that natural compounds can offer valuable starting points for drug development. Many modern medications, including aspirin and certain cancer drugs, were originally derived from plants.

But experts also stress that natural does not always mean safe. The same compound that reduces inflammation in one part of the body may cause problems in another. That is why rigorous testing in clinical trials is essential.

Dr. Takahashi and his team believe that their stem cell-based model could become a valuable tool for discovering new drugs for IBD and other intestinal diseases. It allows researchers to test compounds on human-like tissue without putting patients at risk.

Practical Takeaways for Readers

While this research is exciting, it is important to keep a few things in mind:

– Do not start eating large amounts of black licorice to treat IBD symptoms. The compound in the study is being tested as a drug, not a food.

– If you have IBD, continue working with your doctor and following your current treatment plan.

– Stay informed about new research, but be cautious about unproven supplements or remedies.

– The stem cell model used in this study could eventually help scientists discover many more drug candidates for IBD and other gut-related conditions.

– Clinical trials for glycyrrhizin in humans will be needed before it can become an approved treatment.

The Road Ahead for IBD Research

The development of a stem cell-based human intestine model marks an important step forward in IBD research. It gives scientists a more accurate way to study the disease and test new treatments without relying solely on animal models.

Future studies will likely focus on refining the model, testing glycyrrhizin in human clinical trials, and exploring other compounds that showed promise in the initial screening. Researchers also hope to use the model to study how IBD develops in the first place, which could lead to earlier diagnosis and prevention strategies.

For the millions of people living with IBD around the world, any progress toward better treatments is welcome news. This study adds a promising new chapter to that effort, while reminding us that sometimes the most unexpected sources—like a sweet treat from the candy aisle—can hold surprising potential.

Source: ScienceDaily