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Personalized essential oils may help people recover their lost sense of smell due to COVID-19, according to a new study.

Called olfactory training, the process involves smelling the oils regularly to “challenge” the nerves responsible for sending smell messages to the brain, according to The Mayo Clinic. Those nerves are known to be able to heal and regrow in a process called neuroplasticity.

The study was published last week in JAMA Otolaryngology-Head & Neck Surgery. It included 275 people ages 18 to 71 who reported loss of smell due to COVID-19. Participants sniffed the oils for 15 seconds with a 30-second rest in between odors. The study lasted for 3 months. Head over to WebMD to read the full story.