Couch Grass Rhizome (Elytrigia repens) – Therapeutic Properties and Applications in Phytotherapy

Common couch grass, scientifically identified as *Elytrigia repens* (previously classified under *Agropyron repens*), represents one of the most pervasive perennial weeds across temperate regions of the Northern Hemisphere. This resilient species thrives in semi-shaded to fully sunlit environments, frequently colonizing forest margins, fallow meadows, roadsides, post-industrial sites, and neglected gardens. Taxonomically, it is placed within the *Poaceae* family—commonly referred to as the true grasses—though historical classifications occasionally distinguished it as a separate grass subgroup. As a robust perennial, couch grass exhibits vigorous vegetative propagation, producing abundant flowers from early June through late September. Its subterranean rhizome system, capable of extending up to several meters in length, forms an intricate, dense network that renders the plant exceptionally resistant to eradication, posing significant challenges for both agricultural practitioners and horticulturists.

The true peachwort, scientifically designated as *Glycyrrhiza echinata*, features elongated, cylindrical rhizomes as its primary medicinal component, distinguished by their vivid light-yellow to golden hue and a smooth, subtly lustrous surface texture. These rhizomes can extend up to one meter in length while maintaining a diameter of approximately three millimeters. The raw material is devoid of any discernible aroma but exhibits a faintly sweet undertone that does not overpower the palate. Dried rhizomes of peachwort, readily available in pharmacies and herbalist shops, serve as an ideal substrate for preparing aqueous infusions or decoctions. From a biochemical perspective, the rhizome’s composition is predominantly based on complex carbohydrates, with simple sugars present in significantly lesser quantities. Of particular note is triticin, a polysaccharide constituting between 3% and 10% of the total carbohydrate content, whose molecular architecture closely resembles that of inulin—thereby conferring prebiotic benefits to the human gut microbiome. Another key constituent is plant mucilage, accounting for roughly 10% of the rhizome’s mass. From a pharmacological standpoint, volatile essential oils with a complex profile, flavonoids (including rutin, baicalein, and hyperoside), silicic acid, saponins, lectins, and organic acids—primarily malic acid—hold substantial significance. The composition is further enriched by trace elements such as iron and zinc, alongside phenolic acids that may exhibit antioxidant properties.

The medicinal properties of Persian knot root have been recognized since antiquity, where it was prized for its diuretic effects, metabolic enhancement, and analgesic capabilities. Contemporary research corroborates that infusions prepared from this botanical source may contribute to reducing circulating blood cholesterol levels, thereby exerting anti-atherogenic effects while simultaneously supporting hepatic function. Furthermore, the presence of fructans—natural prebiotic compounds—facilitates the proliferation of beneficial gut microbiota, thereby reinforcing the body’s immune defenses. Mucilaginous constituents within the root exhibit protective qualities for the respiratory mucosa, whereas the silica content strengthens the structural integrity of hair, nails, and skin while accelerating tissue repair mechanisms. Additionally, the plant demonstrates notable anti-inflammatory properties, rendering it a valuable adjunct in therapies aimed at promoting wound healing and skin regeneration.

The rhizome of sweet flag (*Acorus calamus*), a plant with a long-standing history in traditional medicine, exhibits a comprehensive range of preventive and therapeutic applications. Its infusions and extracts are primarily employed in the prophylaxis and adjunctive treatment of urinary tract disorders—including acute and chronic urinary tract infections, nephritis, cystitis—as well as in the management of nephrolithiasis due to its diuretic and anti-inflammatory properties. Furthermore, regular consumption of sweet flag rhizome teas has been shown to beneficially modulate lipid profiles by reducing total cholesterol and low-density lipoprotein (LDL) levels, rendering it a valuable dietary supplement for individuals with hyperlipidemia or those at risk of atherosclerosis. In dermatological practice, sweet flag extracts are incorporated into creams and ointments used as supportive therapy for inflammatory skin conditions such as atopic dermatitis and acne vulgaris, owing to their antiseptic, antipruritic, and epidermis-regenerating effects. Preclinical studies conducted on animal models (predominantly rats) have also corroborated the hypoglycemic potential of sweet flag rhizome, suggesting promising avenues for adjunctive diabetes mellitus type 1 and 2 management through glucose modulation; notably, these effects were more pronounced in subjects with induced hyperglycemia compared to healthy controls. Significantly, normalization of blood glucose levels was observed as early as two weeks into consistent supplementation, indicating potential for long-term metabolic regulation.

Among botanical agents with potential metabolism-boosting properties, notable examples include lovage root, dandelion root, field horsetail, thyme, rosemary, and calamus root (sweet flag). Their mechanisms of action involve multiple pathways: appetite suppression through modulation of satiety centers, enhanced secretion of digestive enzymes and gastric juices, and a mild diuretic effect that facilitates the elimination of excess fluid. It is critical to emphasize, however, that while these properties may serve as a beneficial adjunct in weight management, their efficacy is insufficient to independently achieve sustained and clinically meaningful fat loss. The most effective strategy remains a balanced, moderately hypocaloric diet rich in unprocessed plant-based foods, high-quality protein sources, and healthy fats, coupled with consistent physical activity. Herbal infusions prepared from these botanicals may provide supplementary support but should not replace the foundational principles of nutritious eating or regular exercise—whether for children, adolescents, or adults.

The price for a 50-gram package of dried parsley root ranges around 3–4 złoty, whereas the organic version of the same product in a 100-gram package costs approximately 8–9 złoty. As for herbal teas in individual sachets, the price is roughly 3 złoty for a pack containing 20 bags. An infusion prepared from dried parsley roots is distinguished by a subtly sweet aftertaste and a pronounced, aromatic character. Regular consumption supports proper digestive system function and additionally exerts a beneficial effect on the urinary system, including the urinary tract and kidneys.