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The phytotherapy has been becoming an important alternative to terapeutic all over the world. Thereby, several plants have been commercialized at public markets and fairs in many countries. Schinus terebinthifolius Raddi is a species popularly known as aroeira in Brazil and is considered one of the most consumed plants in our country due to its medicinal properties. This study aimed to evaluate the quality of commercial samples of aroeira, purchased at public markets in São Luis-MA, Brazil. Twelve samples of barks from S. terebinthifolius were purchased and analyzed. Furthermore barks from an identified specimen of this species were used as reference sample. To assure the authentication, the commercial samples were analyzed by morphological and anatomical features, phytochemical profile, moisture content and antibacterial activity and then the results from these samples were compared to reference sample features. Among the 12 samples, the half showed different morphological features from the reference sample.  According to the microscopic study, just five were authenticated as S. terebinthifolius. The phytochemistry evaluation showed different chemistry profiles of commercial samples, mainly regarding to tanins and saponins amount. Five samples were reproved by moisture determination. All samples showed some degree of antibacterial activity against Staphylococcus aureus, however, only six were active against Escherichia coli. Although the importance of phytoterapy has grew, these results show the poor quality of this drug and also show the concerned about the quality of the herbal products commercialized worldwide to assure the consumer safety. Keywords: Authenticity; quality control; Schinus terebinthifolius Raddi.