Question 1

What is olfactory training?

Accepted Answer

Olfactory training, also known as smell training, is a clinically validated therapeutic technique that involves repeatedly and intentionally sniffing a set of specific scents to stimulate and rehabilitate the olfactory system. It is based on the principle of neuroplasticity — the brain's ability to reorganise and form new neural connections. The technique was pioneered by Professor Thomas Hummel at Dresden University and published in peer-reviewed journals.

Question 2

How long does smell training take to work?

Accepted Answer

Clinical studies show that most patients begin to notice improvement within 12 weeks of consistent daily practice. The recommended protocol involves two 20-second sessions per day, morning and evening. Some patients see results in as little as 4 weeks, while others may require 6 months or more. The Hummel Protocol recommends a minimum commitment of 24 weeks for best results.

Question 3

What causes smell loss?

Accepted Answer

Smell loss (anosmia) can be caused by viral infections (including COVID-19), head trauma, nasal polyps, neurological conditions, or aging. Post-viral anosmia is the most common cause, affecting an estimated 1.6 million people in the US alone following COVID-19. Parosmia — distorted smell — is also common after viral infections.

Question 4

Why does the kit use rose, eucalyptus, lemon, and clove?

Accepted Answer

These four scents were selected by Professor Thomas Hummel of Dresden University, whose landmark 2009 study established the clinical protocol for olfactory training. They represent the four primary odour categories: floral (rose), resinous (eucalyptus), fruity (lemon), and spicy (clove), providing comprehensive stimulation of the olfactory system across all receptor types.

Question 5

Can I use any essential oils for smell training?

Accepted Answer

No. The clinical protocol requires 100% pure, undiluted essential oils at specific concentrations. Synthetic fragrances, diluted oils, or perfumes will not produce the same neurological response. The Olfactory Training Kit uses pure, undiluted oils guided by the specifications of the Hummel Protocol.

Question 6

When should I move from Set 1 to Set 2?

Accepted Answer

If you have the Complete Kit, we recommend starting with Set 1 for the first 12 weeks, then switching to Set 2 for the next 12 weeks. Introducing new scents after the initial phase provides fresh stimuli to the olfactory receptors and may accelerate recovery by challenging different neural pathways.

Question 7

Is olfactory training safe?

Accepted Answer

Yes. Olfactory training is a non-invasive, drug-free therapeutic technique with no known side effects. It has been studied in hundreds of peer-reviewed clinical trials and is recommended by ENT specialists and neurologists worldwide. The oils are designed for inhalation only — not for skin application or ingestion.

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FAQ & Protocol Guide

The Olfactory Training Protocol

Product Questions