Evidence follows the exact ingredient
Generic examples include a standardised Moro blood-orange (Citrus sinensis (L.) Osbeck) juice extract and a standardised complex of citrus flavonoids from grapefruit (Citrus paradisi), pomelo (Citrus maxima), and sweet or blood orange (Citrus sinensis), with caffeine from guarana (Paullinia cupana) where specified. Evidence cannot be generalised: identity, specification, dose, population and endpoint must match the studied ingredient. “Fat burn” is consumer shorthand; final claims must follow the substantiated outcome and market rules.