Plant sources：Fisetin extracted from Rhus Succedanea of the family Anacardiaceae, also known as fisetone or fisetin, is a natural flavonoid compound widely found in various fruits and vegetables. 

Plant sources：Eriodictyol is a natural flavonoid mainly extracted from the fruit of Citrus limon in the Rutaceae family and the plant of Dracocephalum in the Lamiaceae family.

Plant sources：As one of the most abundant flavonoid glycosides in lemon (Citrus limon), Eriocitrin is mainly distributed in the peel, pulp and seeds, especially in the peel. In addition to lemons, other citrus plants such as lime (Citrus aurantium) and grapefruit (Citrus paradisi) also contain small amounts of holy herb subsides.

Plant sources：Myricetin is a flavonol compound extracted from the bark of Myrica rubra, a plant of the Myricaceae family.