From the comparison of the data obtained for each strain, the cosmetic product GREENQUAT® BT determines in vitro and under the experimental conditions adopted, a bacteriostatic and bactericidal activity against the S. aureus (ATCC 6538), S. epidermidis (ATC 12228), C. albicans (ATCC 10231), E. coli (ATCC 8739), P. aeruginosa (ATCC 9027) and A. brasiliensis (ATCC 16404) strains. The product is more effective against P. aeruginosa (ATCC 9027), C. albicans and A. brasiliensis (ATCC16404) which show greater sensitivity than the other strains (Table5.1 and Table 5.2.).