Astragalin is a chemical compound. It can be isolated from Phytolacca americana (the American pokeweed) or in the methanolic extract of fronds of the fern Phegopteris connectilis. It is also found in wine. Astragalin is a 3-O-glucoside of kaempferol.

Luteolin 7-glucoside is found in anise. Luteolin 7-glucoside is a constituent of the leaves of Capsicum annuum (red pepper).Cynaroside is a flavone, a flavonoid-like chemical compound. It is a 7-O-glucoside of luteolin and can be found in dandelion coffee, in Ferula varia and F. foetida in Campanula persicifolia and C. rotundifolia and in Cynara scolymus (artichoke). Luteolin 7-glucoside belongs to the family of Flavonoid O-Glycosides. These are compounds containing a carbohydrate moiety which is o-glycosidically linked to one of the flavonoid backbones (2-phenylchromen-4-one, 3-phenylchromen-4-one or 4-phenylcoumarin).

Quercetin is a plant pigment (flavonoid). It is found in many plants and foods, such as red wine, onions, green tea, apples, berries, Ginkgo biloba, St. John's wort, American elder, and others. Buckwheat tea has a large amount of quercetin. People use quercetin as a medicine.

Quercetin is used for treating conditions of the heart and blood vessels including “hardening of the arteries” (atherosclerosis), high cholesterol, heart disease, and circulation problems. It is also used for diabetes, cataracts, hay fever, peptic ulcer, schizophrenia, inflammation, asthma, gout, viral infections, chronic fatigue syndrome (CFS), preventing cancer, and for treating chronic infections of the prostate. Quercetin is also used to increase endurance and improve athletic performance.

Quercetin has antioxidant and anti-inflammatory effects which might help reduce prostate inflammation.