Category:Digestive herbs

A digestive herb is a plant medicine used to support digestion, relieve digestive symptoms, or treat gastrointestinal disease. The category covers the bitters that prime gastric and pancreatic secretion through the bitter-taste reflex (gentian, wormwood, artichoke), the carminatives that relieve postprandial flatulence and dyspepsia through volatile-oil-mediated smooth-muscle relaxation (peppermint, fennel, caraway, ginger, anise, cardamom), the demulcents that protect inflamed gastric and oesophageal mucosa (slippery elm, marshmallow, deglycyrrhizinated licorice), the antispasmodics that relieve intestinal cramp (chamomile, peppermint, mebeverine where regulated as a medicine), and the hepatobiliary herbs whose actions converge on biliary flow (artichoke, milk thistle, dandelion root, schisandra).

The clinical use of digestive herbs is among the oldest documented in medicine. The bitter-tonic tradition runs from the Egyptian and Mesopotamian medical papyri through the Greco-Roman herbalists and into the British Herbal Pharmacopoeia: the principle that a small dose of an intensely bitter plant taken fifteen to thirty minutes before a meal stimulates salivary, gastric, and pancreatic secretion through the cranial-nerve-mediated bitter-taste reflex is consistent across traditions. The carminative tradition is similarly continuous: the Indian Ayurvedic Trikatu (the three-pungent combination of black pepper, long pepper, and ginger), the Greek and Roman use of fennel and dill seed, the medieval European gripe-water preparations for infant colic, and the contemporary peppermint-oil capsule for irritable bowel syndrome are all expressions of the same essential pharmacology of volatile-oil-mediated smooth-muscle relaxation. The peppermint-oil clinical-trial evidence for IBS is the most extensive in the modern digestive-herb literature.^[1]

The contemporary clinical interest in digestive herbs has been substantially shaped by the recognition that several traditional preparations have specific Western-pharmacological mechanisms. Ginger's antiemetic effect in motion sickness, pregnancy-associated nausea, and chemotherapy-induced nausea is supported by controlled trials and is in the GINEMA and PEPI meta-analyses; the proposed mechanism is 5-HT3 receptor antagonism and improved gastric emptying. Artichoke leaf extract's choleretic effect (increased bile flow) and its modest reduction in serum lipids are supported by Commission E and ESCOP monographs. Deglycyrrhizinated licorice (DGL) extracts retain the gastric-mucosal-protective action of licorice without the glycyrrhizin that produces pseudohyperaldosteronism. The bitter-tonic principle has been studied molecularly through the recognition that bitter taste receptors (TAS2R family) are expressed not only on the tongue but on enterochromaffin cells, gastric parietal cells, and the pancreatic islet, providing a molecular basis for the pre-meal-bitter clinical tradition.

Digestive herbs of established clinical use, progressively indexed as their monograph pages are built. Foundational set: peppermint (Mentha × piperita), ginger (Zingiber officinale), fennel (Foeniculum vulgare), German and Roman chamomile (Matricaria chamomilla, Chamaemelum nobile), caraway (Carum carvi), anise (Pimpinella anisum), cardamom (Elettaria cardamomum), dill (Anethum graveolens), gentian (Gentiana lutea), wormwood (Artemisia absinthium), artichoke leaf (Cynara scolymus), milk thistle (Silybum marianum), dandelion (Taraxacum officinale), turmeric (Curcuma longa), slippery elm (Ulmus rubra), marshmallow root (Althaea officinalis), deglycyrrhizinated licorice (Glycyrrhiza glabra DGL form), agrimony (Agrimonia eupatoria), meadowsweet (Filipendula ulmaria), and the Chinese digestive herbs Bai Zhu (Atractylodes macrocephala), Chen Pi (aged citrus peel), and Huo Xiang (patchouli).

The boundary of this category is "herb whose principal or important indication is digestive." Several herbs cross categories: chamomile is digestive and nervine and anti-inflammatory; ginger is digestive and antiemetic and antispasmodic and warming-circulatory. Multi-membership applies across the indication, tradition, and action axes. The pharmaceutical digestive medicines (proton pump inhibitors, H2 antagonists, prokinetics, antispasmodics) are listed under antisecretory agents and prokinetics and antispasmodics respectively, with cross-reference where the herbal and pharmaceutical traditions converge. The non-herbal digestive aids (the bismuth compounds, the loperamide and diphenoxylate opioid antidiarrhoeals, the simethicone for flatulence) are listed under their primary categories.

This category page is an encyclopedia article about its subject. The actual index of herbs belonging to the category is generated automatically by the wiki engine, from category-membership declarations on the individual herb pages, and appears at the foot of the page below the references.