How Infrared Sauna Therapy May Help Restore Your Sense of Smell

Before COVID, most people never thought about their sense of smell. Now millions understand how devastating its loss is. Not being able to smell your morning coffee. Your partner's skin. Your baby's hair. Rain on warm pavement. Dinner cooking. A gas leak. Smoke. These aren't minor inconveniences — they're the sensory threads that connect you to safety, nutrition, memory, and the small moments that make life feel like life.

Anosmia (complete smell loss) and hyposmia (partial loss) affect 12-15% of COVID patients beyond six months. But even before the pandemic, 3-5% of the general population had significant smell impairment — rising to over 25% in people over 50. Depression rates in people with sustained anosmia are significantly elevated. It's an invisible disability that the world is only now beginning to take seriously.

Here's the hopeful fact this article is built on: olfactory neurons are one of the few types of neurons that regenerate throughout your entire life — they're replaced every 30-60 days. Smell recovery IS possible. The question is whether the conditions for that regeneration are optimal. Infrared sauna therapy creates those conditions — and when combined with structured smell training, it provides a practical protocol that addresses olfactory recovery from multiple angles simultaneously.

How smell works — why recovery is possible

Air flows through your nasal passages past the olfactory epithelium — a postage-stamp-sized patch of specialized tissue at the very top of the nasal cavity. Olfactory receptor neurons in this tissue detect odor molecules dissolved in a thin mucus layer and send signals via the olfactory nerve directly to the brain's olfactory bulb.

The olfactory system is unique — it's the only sensory system that sends signals directly to the brain without routing through the thalamus. This is why smells trigger memories and emotions so powerfully and so instantly. And critically: olfactory neurons regenerate every 30-60 days throughout life. For smell to work, you need clear nasal airflow, healthy olfactory epithelium, functional neurons, and intact neural connections. Damage to any of these impairs smell — but the regenerative capacity means recovery is biologically possible.

Why smell is lost

• Post-viral (including COVID): Viruses damage the olfactory epithelium and supporting cells. COVID specifically damages sustentacular cells that support olfactory neurons. Usually temporary — but can persist for months to years
• Chronic sinusitis: Persistent inflammation physically blocks odor molecules from reaching the olfactory epithelium. Nasal polyps compound this
• Allergies: Chronic nasal inflammation reduces airflow and can damage olfactory tissue over time
• Aging (presbyosmia): Olfactory neuron regeneration slows. The epithelium thins. By age 80, approximately 75% of people have significant smell impairment
• Head trauma: The olfactory nerve passes through tiny holes in the skull. Impact can shear these delicate fibers
• Nasal polyps: Benign growths that physically obstruct airflow and compress olfactory tissue
• Medications: Certain antibiotics, antihypertensives, and chemotherapy drugs can impair smell as a side effect

How infrared sauna therapy supports smell recovery

1. Improved nasal and sinus circulation

The olfactory epithelium depends on blood supply for nutrient delivery, immune surveillance, and — critically — the ongoing neuronal regeneration that smell depends on. Far infrared heat dilates blood vessels in the nasal passages and sinuses, dramatically increasing blood flow to the olfactory region. Better circulation delivers more growth factors and nutrients to damaged tissue, and more immune cells to fight chronic infections that may be impairing smell. Many people report their sense of smell sharpening during or immediately after sessions.

2. Reduced nasal inflammation

Chronic inflammation is the #1 ongoing cause of smell impairment. Inflammation swells nasal tissue, physically blocking airflow to the olfactory epithelium. Inflammatory cytokines (TNF-alpha, IL-6) also directly damage olfactory neurons. Far infrared reduces these cytokines systemically and locally. As inflammation decreases, nasal passages open, allowing odor molecules to reach the epithelium again.

3. Neuronal regeneration support

Olfactory neuron regeneration requires blood flow, BDNF and other growth factors, reduced inflammation, and functional supporting cells. Far infrared increases BDNF production — brain-derived neurotrophic factor that supports neuronal growth. Heat shock proteins protect existing neurons during regeneration. Red light therapy at 630nm and 850nm has additional evidence for nerve cell stimulation — potentially supporting olfactory neuron repair directly through photobiomodulation.

4. Mucus normalization

The olfactory epithelium is covered by a thin mucus layer that odor molecules must dissolve into before reaching receptors. Too thick (sinusitis, allergies) and molecules can't penetrate. Damaged or absent (post-viral) and receptors are exposed and dysfunctional. Infrared helps normalize mucus viscosity. Post-sauna nasal saline rinse clears thick mucus and allergens, further improving airflow to the olfactory region.

5. Autonomic rebalancing

The autonomic nervous system regulates nasal blood flow, mucus production, and the nasal cycle (alternating congestion between nostrils). Chronic stress constricts nasal blood vessels and reduces mucosal blood flow. Infrared therapy shifts autonomic balance toward parasympathetic — improving nasal blood flow and creating optimal conditions for olfactory function.

The post-COVID smell recovery connection

COVID damages sustentacular cells (the supporting cells of the olfactory epithelium) more than the olfactory neurons themselves. This is actually good news — it means the neurons may be intact but unsupported and unable to function. Recovery requires regeneration of these supporting cells, resolution of lingering inflammation, and restoration of blood supply.

Infrared sauna therapy addresses all three: improved circulation for nutrient delivery, reduced inflammatory cytokines for tissue healing, and BDNF/HSP support for cellular regeneration. The current gold-standard rehabilitation for anosmia is smell training — repeated, deliberate sniffing of specific scents. Combining smell training with sauna therapy (training immediately post-sauna while circulation is elevated) may create the most favorable conditions for recovery.

The smell restoration protocol

Step 1 — Infrared sauna session

130-135°F, 25-35 minutes. Position your face toward the front VantaWave heater panel to warm the nasal and sinus region directly. This maximizes blood flow to the olfactory epithelium.

Step 2 — Nasal saline rinse

Immediately after exiting, use a neti pot or saline nasal rinse while mucus is thinned and passages are dilated. This clears congestion and allergens, opening the airway to the olfactory region.

Step 3 — Smell training

While nasal passages are clear and olfactory circulation is maximally elevated, do smell training with the four scents recommended by AbScent (the leading anosmia charity): rose, lemon, eucalyptus, and clove. Hold each scent near your nose for 20 seconds. Concentrate deeply on what you detect — even if it's nothing at first. This stimulates the neural pathways. Essential oil jars work well.

Consistency and tracking

Daily for a minimum of 3-6 months. Olfactory neuron regeneration takes 30-60 days per cycle, and full recovery may require multiple regeneration cycles. Keep a smell journal: rate your ability to detect each training scent from 0 (nothing) to 10 (clear and strong). Note "spontaneous smell moments" — times you unexpectedly catch a scent during the day. These are the earliest signs of recovery.

Supplements that support olfactory recovery

• Omega-3 fatty acids: support neuronal membrane integrity
• Vitamin A: critical for olfactory epithelium maintenance — the mucus layer is vitamin A-dependent
• Zinc: supports olfactory receptor function
• Alpha-lipoic acid: antioxidant used in German protocols for post-viral anosmia — may support nerve regeneration

When to see an ENT

Realistic expectations

Infrared sauna therapy creates optimal conditions for olfactory recovery — it doesn't guarantee it. Some people recover fully. Some recover partially — regaining some scents but not others, or detecting smells at reduced intensity. Some see minimal improvement, particularly with very long-standing damage or severe nerve injury.

The sauna + smell training combination is the most proactive protocol available for people trying to recover their sense of smell. It addresses circulation, inflammation, neuronal support, and active neural stimulation simultaneously. If your olfactory neurons retain the capacity to regenerate — and in most cases they do — this protocol gives them the best possible environment to do so.

For related support, see our guides to allergies and sinus relief, halotherapy (salt therapy), and chronic infection immune support. SaunaCloud's custom infrared saunas with zero-glue construction are important here — chemical exposure from off-gassing can further damage olfactory tissue.