(-)-trans-Myrtanol is an antimicrobial and acaricidal monoterpenoid compound that demonstrates potent inhibitory activity against harmful intestinal bacteria. It also exhibits strong acaricidal effects against Dermatophagoides farinae, D. pteronyssinus, and Tyrophagus putrescentiae, with reported LD50 values of 2.30 µg/cm², 2.22 µg/cm², and 12.95 µg/cm², respectively. These properties highlight its potential utility in studies of microbial control, mite management, and natural-product-based bioactive agents.