Rooibos tea, a caffeine-free drink made from the leaves of a shrub indigenous to South Africa, is part of the country's heritage and may offer powerful health benefits for the gut, according to new research.
What is Rooibos Tea?
The rooibos plant (Aspalathus linearis) grows in the mountainous Cederberg region of South Africa's Western Cape province. It has been traditionally harvested and consumed as a herbal tea by the Khoisan people. Beyond making tea, the plant has been touted for its potential health benefits. Rooibos has scientifically proven effects as an antioxidant, a natural substance that helps protect your body's cells from damage caused by harmful molecules. It is also an anti-inflammatory, reducing redness, swelling, and pain in the body. It can help protect the heart and liver, regulate blood sugar, and improve skin health.
Research on Gut Health
Commercial cultivation of rooibos began in the early 20th century, and scientific research into its health benefits started in the 1960s when its antioxidant properties were first reported. Since then, numerous studies have explored its therapeutic potential. A researcher focusing on the health-promoting properties of South African herbal teas, particularly rooibos and honeybush, conducted a study with colleagues suggesting rooibos might offer powerful benefits for the gut.
The study aimed to compare the anti-inflammatory and barrier protective effects of unfermented and fermented rooibos aqueous extract on intestinal porcine epithelial cells. Pigs were used because their intestines closely resemble human gut cells. The research showed that rooibos extracts made the lining of the gut stronger through their effect on proteins and reduced inflammation. These effects are important because stronger barriers and controlled inflammation are essential for protecting tissues like the gut from damage and disease.
Digestive Disorders and Gut Health
Digestive disorders like irritable bowel syndrome (IBS), constipation, and dyspepsia affect over 40% of the global population. Females are more likely to be affected (49%) than males (36.6%). These statistics show the need for increased awareness, improved diagnosis, and effective management. Gut health has become a major area of interest for anyone looking to improve overall wellness. A growing body of evidence links poor gut health to issues like chronic inflammation, fatigue, anxiety, and autoimmune disorders. With rising interest in natural alternatives to pharmaceuticals, people are turning to diet and drinks for help.
Green and Red Rooibos: Different Effects
The study focused on two forms of rooibos: unfermented (green) rooibos, which is less processed and retains more antioxidants, and fermented (red) rooibos, which is more common and widely consumed. Both kinds come from the same plant, but processing changes their chemical composition, especially their polyphenols—natural compounds known for antioxidant and anti-inflammatory properties. The main polyphenols are aspalathin and nothofagin, with aspalathin unique to rooibos.
The three-year study investigated the anti-inflammatory properties of rooibos extracts in intestinal gut cells of pigs. Cells were first treated with the extracts for 24 hours, then the extracts were removed and a bacterial toxin was added for an additional 24 hours. The cells' response was evaluated by measuring specific markers of inflammation and barrier integrity.
Key Findings
- Fermented (red) rooibos fights inflammation best. When an inflammatory response was triggered in gut cells, fermented rooibos was especially effective at reducing inflammation, performing as well as or better than dexamethasone, a common steroid drug used to reduce gut inflammation.
- Unfermented (green) rooibos strengthens the gut barrier. It boosted the production of proteins that keep the barrier strong, suggesting it may help prevent 'leaky gut,' protecting against harmful substances entering the bloodstream.
- Polyphenol differences might explain the results. Unfermented rooibos contains high levels of aspalathin, a potent antioxidant that helps maintain cell health and strengthen barriers. Fermented rooibos contains different polyphenols, such as eriodictyol-glucosides, that work together with other natural antioxidants to soothe and reduce inflammation.
While rooibos is already known to be rich in antioxidants, this study is one of the first to clearly show how different types of rooibos affect gut inflammation and the gut barrier in distinct ways. Understanding this can help people make smarter dietary choices and potentially give rooibos a role in gut-friendly therapies or functional foods.
Moving Forward
The research shows that rooibos tea, both fermented and unfermented, offers unique benefits for gut health. Fermented rooibos can reduce gut inflammation, and unfermented rooibos can help maintain a healthy gut lining. Rooibos could one day be used in gut health supplements, as natural therapies for inflammatory bowel disease, or in everyday foods designed to support digestion. This was a laboratory-based study, so more research is needed to confirm the effects in humans. But the evidence so far is promising. Considering that rooibos is safe, affordable, and already widely consumed, it is a low-risk addition to a healthy lifestyle.
