In the developed world, the rise of the pharmaceutical industry has meant that modern drugs overshadow the use of herbal medicines. But, many people still take herbal remedies with the perception of a gentler, safer, more natural form of medicine.

At the same time, research continues into medicinal plants and their constituents. The current interest in gut health, particularly the gut microbiome, has given rise to a whole new area for research.

Now, emerging information supports the use of plant medicines for gut health by highlighting the beneficial effects of some herbs on the gut microbiome.

In this post, I want to explain how herbs can influence your gut microbial diversity and overall wellbeing.

Your digestive system hosts a community of microorganisms that are important in maintaining your overall health. These microbes break down your food, make essential vitamins, protect you from harmful pathogens and communicate with your brain via the gut-brain connection.

Ideally, your microbiome would include a wide diversity of microbial species in an appropriate balance, with no species dominating the community. Any disruption to this balance can affect the functions of the gut microbiome and your overall health.

Traditional healing systems have recognised the relationship between herbs and digestion for centuries. This recognition also explains why many of our culinary herbs and spices are used, not just for their flavour but because they aid our digestion in various ways.

Modern research may describe the mechanisms and benefits of using herbs such as ginger, oregano or peppermint, but people have instinctively known the benefits of these plant medicines for years. Herbs and spices are included in traditional cuisines worldwide.

Here are some herbs that support gut health in multiple ways.

Turmeric

Turmeric is a prime example. It contains curcumin, a golden yellow compound known to reduce inflammation, promote the growth of beneficial bacteria and rebuild your gut microbiome. Research shows curcumin helps to maintain the gut barrier between the digestive system and the rest of the body.

An intact gut barrier creates an ideal environment for maintaining a healthy, balanced gut microbiome. An effective barrier means that beneficial bacteria can thrive, while the immune system can keep harmful bacteria in check.

Cinnamon

Cinnamon is another good example of a herb with a wide range of health benefits. In terms of gut health, it behaves as a prebiotic, providing nourishment for the growth of beneficial bacteria. It also contains a compound called cinnamaldehyde that has antimicrobial properties. Cinnamaldehyde specifically targets the harmful gut bacteria. Overall, this combination of actions improves gut microbiome diversity and supports gut health.

But that’s not all. Cinnamon also regulates digestive enzymes, including those responsible for breaking starches into sugars. Slowing down carbohydrate digestion helps slow the rate at which glucose enters the bloodstream, supporting better metabolic health.

In addition, the anti-inflammatory properties of cinnamon can reduce gut inflammation and soothe the digestive tract. It also contains antioxidants that protect the digestive system from oxidative stress.

Peppermint

Peppermint is a remarkable and versatile herb for digestive health. Scientific studies reveal it calms intestinal muscle contractions while enhancing microbial diversity. Its active compounds work in various ways, supporting both short-term symptom relief and long-term gut health.

Peppermint also contributes to maintaining gut barrier integrity and regulating immune responses. Overall, these findings suggest that peppermint can be helpful for a range of digestive issues.

Ginger

This fiery spice has a wide range of health benefits, that stem from its complex chemistry. This rhizome contains compounds that stimulate stomach emptying, reduce inflammation, and enhance nutrient absorption.

Research shows the multiple benefits of ginger on aspects of digestive health and explains its widespread use in traditional medicine systems globally.

Antibiotics, while potentially life-saving in combating infections, definitely pose challenges for gut health. These medications often disrupt the balance and diversity of the gut microbiome because they eliminate both harmful and beneficial bacteria. Such disruption can have long-term consequences, affecting digestion and overall health.

In fact, it can take several months or even years before the microbiome can recover. And, given what we know about the importance of a healthy gut microbiome, there is renewed interest in herbal medicines that support microbial diversity.

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Probiotic supplements are a popular option for helping to rebuild your gut microbiome, for instance after taking antibiotics. Fermented foods are also rich sources of probiotic microbes.

But, herbs can also aid in the restoration of a healthy gut microbiome. Herbs contain a wide variety of compounds that can influence the balance of bacteria in your gut.

For instance, oregano and thyme contain terpenoids that selectively inhibit harmful bacteria while promoting beneficial flora.

Recent research shows that even small amounts of herbs can significantly impact gut microbiota diversity. Adding just 3/4 teaspoon daily of herbs and spices like cinnamon, ginger, cumin, turmeric, rosemary, oregano, basil, and thyme can increase beneficial gut bacteria.

Herbs such as Triphala, slippery elm, and liquorice root are prebiotics that nourish and promote beneficial bacteria while reducing harmful ones.

Herbs can be a simple and effective way to help your gut health if you eat them on a daily basis. Research shows that adding more polyphenol-rich herbs to your meals is specifically associated with having lower levels of opportunistic and harmful gut bacteria while supporting the growth of beneficial species.

• Cloves (16048 mg/100g)
• Dried Oregano (3117 mg/100g)
• Dried Sage (2919 mg/100g)
• Caraway (2913 mg/100g)
• Dried Rosemary (2,518 mg/100g)
• Turmeric (2117 mg/100g)
• Dried Thyme (1815 mg/100g)
• Star Anise (1810 mg/100g)
• Dried Dill (1250 mg/100g)
• Fresh Thyme (1173 mg/100g)
• Fresh Peppermint leaves (980 mg/100g)
  Fresh herbs generally have lower polyphenol content per 100g

Many herbs contain polyphenols that act as prebiotics, feeding beneficial bacteria (see the table above) and rebuilding your gut microbiome. Others have essential oils with antimicrobial effects or compounds that strengthen gut barrier function and regulate immune responses. Usually, herbs contain multiple different medicinally active compounds.

Traditional healing practices have long relied on whole plant medicines rather than the isolated compounds that interest the pharmaceutical companies who focus on single “active ingredients” for drug development.

Herbalists recognise the value in the synergy of interactions between multiple compounds present in medicinal herbs. What’s more, research shows that crude plant extracts frequently demonstrate greater therapeutic effects than isolated constituents at equivalent doses, as the various compounds work together to enhance bioavailability, promote healing effects, and reduce potential toxicity

The complex array of plant chemicals in whole herbs creates a balanced, multi-targeted approach where compounds complement and amplify each other’s actions, often producing effects greater than what we might expect from individual components alone.

Fermented foods are rich sources of probiotics that are known for their health benefits. Combining these with specific herbs enhances their effectiveness beyond the benefits of either the probiotics or herbs alone.

There is strong evidence that herbs and probiotics work synergistically to promote gut health in several ways:

• Herbs like chicory root, garlic and dandelion root contain prebiotic fibres such as inulin that serve as food for the probiotics.
• Anti-inflammatory herbs such as ginger or peppermint create favourable conditions for probiotics by reducing inflammation and soothing the gut lining.
• Certain herbs have anti-microbial properties that reduce the numbers of harmful bacteria while supporting the growth of beneficial species. This is especially the case when probiotics and herbs are combined.

Culinary herbs are generally safe when they are eaten in typical amounts with food. Having said that, herbs do have medicinal properties, so if you take medications, it is advisable to check that the herbs you are adding to your diet do not interact with your medicine.

In addition, as with any other food, it is a good idea to follow good food hygiene practices. Ensure proper storage and handling, and wash fresh herbs thoroughly before use.

With herbs, if you want to maximise their potential, timing matters. Bitter herbs are most effective before meals, as they stimulate the production of digestive juices. While carminative herbs like peppermint or ginger show greater benefits when taken after eating.

Nutrient-dense “superfoods” such as leafy greens, berries, and certain nuts support gut health by providing fibre, polyphenols, and other beneficial compounds. Research indicates that combining herbs and spices with certain foods can improve gut health and nutrient absorption. A good example of this is adding black pepper to foods. Black pepper contains the compound piperine which enhances the bioavailability of nutrients from food.

In conclusion, the connection between herbs and gut health brings together traditional knowledge and modern science. Herbs support gut microbial diversity in several ways, acting as prebiotics, providing anti-microbial compounds that target harmful bacteria, and polyphenols that feed beneficial microbes and help to rebuild your gut microbiome. Whether used in cooking or as remedies, herbs like turmeric, cinnamon, peppermint, and ginger work together to balance and diversify the gut microbiome.

Beyond improving microbial diversity, herbs strengthen your gut barrier, support immunity, and reduce inflammation. These combined effects create the ideal conditions for beneficial bacteria to thrive and promote better digestive health. Their long-standing use throughout history shows their value as natural remedies. Whether used in cooking or brewed as tea, herbs provide a natural, proven way to boost gut health.