The essential oil content of the plant varies from 0.5% to 3.8% (the higher the content, the more flavor intensity). Of that, the composition varies between mostly (50% to 85%) Carvacoral or Thymol, followed by up to 15 more compounds like p-cymene, v-terpinene, caryophyllene, myrcene, and others. (see this research for more details)