BEIJING EARLYBIRD INDUSTRY DEVELOPMENT CO.,LTD. sell "Citrus Bioflavonoid"

Flavonoids, or bioflavonoids, take their name from the Latin "flavus" (yellow), reflecting their natural color, and form a class of plant secondary metabolites. From the mid-1930s to the early 1950s they were referred to as Vitamin P, likely due to their effect on vascular capillary permeability, though that name is no longer in use.