Slippery Elm (Ulmus rubra)

Psyllium, also known as flea seed due to its small brown appearance, is produced by several Plantago species. It has been used as a safe and effective laxative for thousands of years across Europe, North Africa, and Asia. The seeds and husks have a bland taste and develop a jellylike consistency when moistened due to their high mucilage content. The plants are extensively cultivated, especially in India, and propagated from seed in spring. Seeds are harvested when ripe in late summer and early autumn.

Calendula (Calendula officinalis), with its bright orange daisy-like flowers, is among the most versatile herbs in Western herbal medicine. Its petals contain antiseptic, anti-inflammatory, and vulnerary properties, making it excellent for speeding tissue repair in wounds, burns, bruises, and various skin irritations. Calendula is also used internally for gastrointestinal inflammation (e.g., Crohn’s disease, colitis, gastritis).

Chinese rhubarb (Rheum palmatum) is a thick-rhizomed perennial, growing up to 10 ft (3 m) tall, with large, palmate leaves and small flowers. Known in Chinese medicine for over 2,000 years, it has a paradoxical effect on the bowels: stimulating in large doses, yet gently astringent and constipating in small doses. The rhizome also aids digestion, helps counter inflammation, and has anti-ulcer and antibacterial actions.

Bacopa, also known as Water Hyssop or Brahmi, is a creeping succulent perennial that can grow to about 20 inches. It features spatula-shaped fleshy leaves and pale blue or white flowers on slender stalks. Thriving in marshlands and along the edges of mangrove swamps in warmer temperate and tropical climates—especially southern Asia—it develops into dense mats on mudflats. This herb has been a cornerstone of Ayurvedic medicine for supporting cognitive function and treating various nervous system disorders, and it is increasingly recognized in Western herbalism for its brain-enhancing properties.

Cat's claw is a climbing vine that can grow to 100 feet or more, with stems up to 8 inches in diameter, large glossy leaves, and sharp hooks resembling a cat's claws. Native to tropical rainforests in the central and eastern Andes—especially Peru, Ecuador, and Colombia—it has also been found in Guatemala, Costa Rica, and Panama. Known by the Ashaninka and other indigenous peoples of central Peru for its power in regulating illness, it has been used since ancient times to treat serious conditions ranging from asthma and diabetes to arthritis and cancer. By the early 1990s, over-collection from the wild threatened the species' survival; only sustainably sourced stem bark should be used, rather than root bark.

Irish moss is a reddish-brown seaweed growing to 10 inches, with a flat, forked plant body and fan-shaped outline. Found on the Atlantic coasts of Europe and North America, it grows just below the waterline, attached to rocks and stones. In summer in North America and in autumn in Ireland, it is pulled up by hand or with a rake at low tide and dried in the sun. This seaweed is used extensively in the food and pharmaceutical industries as an emulsifying and binding agent, appearing in products such as toothpastes. Its polysaccharides become jelly-like and demulcent when immersed in water, making it valuable both as a food ingredient and medicinal herb.

Stone root is a perennial herb growing to 3 feet tall, characterized by a square stem, oval leaves, and clusters of greenish-yellow flowers. Native to moist woodlands of eastern North America, the root is harvested in autumn. The plant contains volatile oil, tannins, and saponins.

Aloe vera (syn. A. barbadensis) is a succulent commonly grown as a potted plant, notable for its thick, fleshy leaves that contain two distinct medicinal components. The inner clear gel is renowned for its soothing and wound-healing properties, while the bitter yellow sap from the leaf base (often called “bitter aloes”) has a strong laxative effect. Historically, aloe vera has been prized for treating skin irritations, burns, and ulcers. It can also be taken internally (as juice) to support digestion and immune function. Whole leaf aloe juice has been used to help fight arthritis, AIDS, cancer, and other chronic conditions, though the outer leaf portion containing anthraquinones is typically filtered out to avoid harsh laxative effects.