essential oils for hyposmia and anosmia
Currently the most well-known method to improve the symptoms of olfactory dysfunction is “olfactory training” using essential oils. The essential oils used in olfactory training typically include rose, lemon, clove, and eucalyptus, which were selected based on the odor prism hypothesis proposed by Hans Henning in 1916.
Essential oils are a core component of olfactory training (smell training), a clinically recognized method to help people with a reduced sense of smell (hyposmia) or total loss of smell (anosmia). This therapy involves repeatedly and deliberately smelling specific scents to stimulate the olfactory system and help damaged neural pathways regenerate.
Recommended Essential Oils
The standard olfactory training protocol uses four specific essential oils, chosen to represent different categories of the “odor prism” (floral, fruity, spicy, and resinous):
Rose (floral)
Lemon (fruity)
Clove (spicy)
Eucalyptus (resinous/ethereal)
More advanced protocols may incorporate additional essential oils, such as peppermint, lavender, cinnamon, or grapefruit, to provide a wider range of stimuli.
How to Perform Olfactory Training
Olfactory training is a simple, at-home process that requires consistency.
Gather Supplies: Obtain the four essential oils (pure oils are recommended) and small jars or scent vials. Smell training kits are also available for purchase from online retailers.
Establish a Routine: Find a quiet place free from other strong smells. Perform the training at least twice a day for several months.
The Process:
Open one essential oil bottle or jar and hold it just below your nose (do not insert it into the nostril).
Inhale slowly and gently for 15-20 seconds.
As you inhale, concentrate and visualize what you are smelling, trying to recall memories or associations with that scent.
Take a short break (about 10-15 seconds) before moving to the next scent.
Repeat the process with each of the four oils.
Track Progress: Keep a log or diary to track your progress over time. Do not be discouraged if you do not notice immediate improvement; it can take time.
Vary Scents: Some studies suggest changing the essential oils used every 12 weeks for better results.
Safety Note
If your loss of smell (hyposmia) persists, it is important to consult a doctor or healthcare provider to rule out underlying conditions and receive appropriate medical advice. Ensure your home has working smoke detectors and a gas leak detector, as hyposmia can pose safety risks.