Breuzinho, also known as breu branco ("white breu"), is a natural resin from Protium heptaphyllum, a medium-sized evergreen tree in the frankincense family, native to the Amazon rainforest and widely distributed across tropical Central and South America. When the bark is wounded, a sticky, initially milky-white resin seeps out and hardens in the air into firm, pale, slightly tacky lumps, traditionally gathered in clumps or rough pieces. The genus Protium comprises over 100 species, several of which yield similar resins across Amazonia sold collectively as "breu" — breuzinho is considered among the most aromatic and prized of these varieties. The tree itself can reach up to 30 metres in height and is easily recognised by its smooth, pale grey bark and feathery, leathery leaves. Botanically, Protium heptaphyllum belongs to the same family as frankincense and myrrh, which explains its similar incense profile; unlike those species, however, the tree grows not in arid desert regions but in the humid lowlands of the Amazon basin.

Indigenous peoples and traditional healers across Amazonia, particularly along the Rio Negro and in the Brazilian state of Pará, have used breuzinho for generations in cleansing rituals, believed to clear negative energy, purify spaces, and deepen meditation and shamanic ceremonies. It was traditionally also valued for its expectorant properties, easing breathing, soothing coughs, and calming the respiratory system — a use it shares with other Amazonian resins such as copal and palo santo. In cities like Belém, breuzinho continues to be sold in traditional markets today, often alongside other regional healing resins, and remains a staple of Umbanda and Candomblé practice in parts of Brazil. Beyond ritual use, the resin has traditionally also served as a waterproof caulk for canoes and vessels, and, in diluted form, as the basis for torches used to light riverside villages.

Burned, breuzinho releases a rich, earthy, faintly citrusy fragrance with balsamic and woody undertones — some describe it as a blend of pine, frankincense, and vanilla, with a pleasant freshness often missing from darker Amazonian resins. Its calming scent is said to reduce stress, sharpen concentration, and lift the mood, which is why it is often compared to frankincense and copal, and increasingly valued in modern incense blends as a brighter, fresher alternative to heavier resins. Thanks to its comparatively mild, easy-to-tolerate smoke, breuzinho also suits longer incense ceremonies well and is recommended by many as a gentler entry point into the world of Amazonian resins before moving on to more intense materials such as copal negro.