Botanical
Black Currant
Black currant (Ribes nigrum) is a shrub whose dark berries are used for juice and whose seeds give an oil containing gamma-linolenic acid.
Also listed as Blackcurrant, Black Currant Seed Oil, Cassis, European Black Currant
Match the preparation to the question
Anthocyanin amounts describe the fruit pigments used in the glaucoma trial. Seed oil instead supplies fatty acids, including gamma-linolenic acid, or GLA. A leaf tea or aqueous leaf extract belongs to another category again; the three cannot be treated as interchangeable versions of one treatment. 1 2 3