Menthol and eucalyptus activate TRP channels, inhibiting heat and pain pathways and activating cooling and pain relief pathways, leading to an analgesic effect.

“what was happening we now know that Menthol peppermint and other things that smell that way and taste that way actually have an impact on the sensory neurons at the level of the skin and can actually inhibit certain Sensory neurons and can activate other Sensory neurons”