Grapefruit is a source of vitamin C, fiber, potassium, pectin, and other nutrients. People use the fruit, oil from the peel, and extracts as medicine. Drug interactions with grapefruit juice are well documented. Before adding it to your diet, check with your healthcare provider if you take medications.

https://www.webmd.com/vitamins/ai/ingredientmono-946/grapefruit

Black walnuts are celebrated for their bold, earthy flavor and impressive nutrient profile. They have been associated with many health benefits like reduced heart disease risk and weight loss. The antioxidant and antibacterial compounds in their outer shells, or hulls, make them useful for naturally treating parasitic and bacterial infections.

https://www.healthline.com/nutrition/black-walnut#intro

Slippery elm, or Ulmus rubra, is a tree native to the central and eastern United States and Ontario, Canada. The tree is known for its dark brown to reddish brown bark and can reach a height of 60-80 feet. Native Americans would peel its slimy, red inner bark from twigs and branches and use it as a remedy for many common ailments, like fevers, wounds, and sore throats. They found that when the bark is mixed with water, it generates a sticky material known as mucilage, which is therapeutic and soothing to anything it touches. The Native Americans would also wrap the inner bark of the slippery elm around their meat to keep the meat from going bad. Slippery elm bark was later picked up by American soldiers to heal gunshot wounds during the American Revolution. Slippery elm is also called red elm or Indian elm. The inner bark is the only part used for therapeutic purposes.

https://www.healthline.com/health/food-nutrition/slippery-elm-bark#What-Is-Slippery-Elm-Bark?

Goldenseal (Hydrastis canadensis) is a perennial plant native to eastern North America. Its roots and leaves have been used in traditional medicine to treat a variety of ailments, especially those involving infections or inflammation. Today goldenseal ranks amongst the most popular herbal remedies worldwide. Teas, herbal extracts, or capsules sourced from this plant are used to treat colds, hay fever, digestive problems, sore gums, and skin problems. Goldenseal is also added to various over-the-counter remedies, such as ear drops, feminine hygiene products, eyewash formulations, cold and flu remedies, allergy relief products, laxatives, and digestive aids. The herb is naturally rich in a class of alkaloid compounds, with berberine, hydrastine, and canadine being found in the highest concentrations. These alkaloids are linked to antibacterial and anti-inflammatory properties and believed to be the main reason behind goldenseal's purported health benefits

https://www.healthline.com/health/goldenseal-cure-for-everything

Bearberry is perhaps most well-known and historically used to treat bladder and urinary tract infections. With a history of medicinal use stretching back to at least the 2nd century, it has been widely used as a diuretic, astringent and antiseptic. Native Americans used it as a headache cure, to treat cystitis and as a general tonic for strengthening the kidneys.

https://www.indigo-herbs.co.uk/natural-health-guide/benefits/bearberry