Liberine is an isolate of

coffee bean A coffee bean is a seed of the '' Coffea'' plant and the source for coffee. It is the pip inside the red or purple fruit often referred to as a coffee cherry. Just like ordinary cherries, the coffee fruit is also a so-called stone fruit. Even th ...

tea Tea is an aromatic beverage prepared by pouring hot or boiling water over cured or fresh leaves of ''Camellia sinensis'', an evergreen shrub native to East Asia which probably originated in the borderlands of southwestern China and north ...

, cola nuts,

guarana Guaraná ( from the Portuguese ''guaraná'' ), ''Paullinia cupana'', syns. ''P. crysan, P. sorbilis'') is a climbing plant in the family Sapindaceae, native to the Amazon basin and especially common in Brazil. Guaraná has large leaves and c ...

, cocoa, and

yerba mate Yerba mate or yerba-maté (''Ilex paraguariensis''; from Spanish ; pt, erva-mate, or ; gn, ka'a, ) is a plant species of the holly genus '' Ilex'' native to South America. It was named by the French botanist Augustin Saint-Hilaire. The lea ...

References

Purines Alkaloids Methoxy compounds {{Alkaloid-stub