Should Terpinen-4-ol levels be maximised and 1, 8-cineole levels be minimised?
Fact: Terpinen-4-ol is the main antimicrobial component of TTO. Levels of terpinen-4-ol in TTO are inversely proportional to levels of 1, 8-cineole. In other words if terpinen-4-ol levels are high then 1, 8-cineole levels are low. Terpinen-4-ol is the main antimicrobial component of TTO and to a limited extent; higher levels will correspond to higher activity. However, increasing the levels of terpinen-4-ol above 40% is unlikely to offer any additional benefit compared to oil that just meets the international standard.