The efficacy of Psidium guajava seeds is to smooth the bowels, clear the lungs and resolve phlegm, and its role is to treat lung fever, cough and asthma, and lung deficiency.

Guadeloupe seed fruit is ovoid flat oval, light brown to brown surface, smooth, edge with a ring of grooves, apical tip with seed umbilicus, the base is bluntly rounded or narrower. Seed coat hard, cut open the visible inner seed coat membranous, color gray to gray-green, containing two yellow-white cotyledons, rich in oil. The fruit is ovate flat ellipsoid, 11-16mm long, 6-12mm wide, 2-3.5mm thick, with a light brown to brown surface, smooth, with a ring of grooves on the edge, apical tip with an umbilicus, and an obtuse rounded or narrower base. The testa is hard, and when cut open, the inner testa is membranous, grayish white to grayish green, containing two yellowish-white cotyledons, rich in oil.

The role is some kind of object in a certain process in a certain space (or not) at a certain time (or not), as a means, a tool, and ultimately achieve the effect.