The most effective way to reset your sense of smell is olfactory training, a structured practice of sniffing specific scents twice a day for at least 12 weeks. Whether your smell faded after a cold, COVID-19, or another viral infection, or you’ve just noticed it dulling over time, this technique works by retraining your brain’s scent-processing circuits. Most people see measurable improvement, and combining it with a few supporting strategies can boost your results further.
Why Smell Loss Happens and How Recovery Works
Most cases of reduced or lost smell follow a viral infection. The virus damages the specialized nerve cells high inside your nasal cavity that detect odor molecules and relay signals to your brain. The good news: these neurons are among the few in your body that regenerate throughout your life. Your olfactory system is remarkably plastic, meaning it can rewire and rebuild connections even after significant damage.
For many people, this healing happens on its own. About 60 to 70 percent of people recover their sense of smell within four weeks of a viral infection. By two months, roughly 78 percent have full recovery, and by six months, that number climbs to 95 percent. But if you’re in the group that doesn’t bounce back quickly, or if your smell has been off for months, active retraining can accelerate the process significantly.
How Olfactory Training Works
Olfactory training is the closest thing to a proven “reset” for your nose. The protocol, developed by researchers and used in clinics worldwide, involves smelling four distinct scents twice a day, every day, for a minimum of 12 weeks. The standard scents are rose, eucalyptus, lemon, and clove. Each one represents a different odor category, which helps stimulate a broad range of your smell receptors.
Here’s the routine: pick up one scent, hold it close to your nose, and sniff gently for about 15 seconds. While you do this, actively try to recall what that scent used to smell like. Then move on to the next one. The whole session takes about a minute. You do it once in the morning and once in the evening.
The “trying to remember” part isn’t just a nice idea. It’s a core mechanism. Brain imaging studies show that olfactory training physically changes how your brain’s scent-processing areas connect with each other. Before training, people with smell loss show abnormal wiring patterns in these regions. After 12 weeks of training, those aberrant connections disappear and are replaced by healthier ones. The act of sniffing itself, even without detecting an odor, activates the olfactory system and primes it for reorganization.
You can buy olfactory training kits with essential oils, or make your own by soaking cotton pads in rose, eucalyptus, lemon, and clove essential oils and storing each in a small glass jar. Replace the oils every two to three weeks as they fade.
Boosting Your Results
Olfactory training alone works, but combining it with other approaches may improve outcomes. A meta-analysis found that combination therapies were associated with recovery rates about 65 percent higher than training alone.
Omega-3 fatty acids show promise as a complement. Two out of three clinical studies found that omega-3 supplements acted as a protective factor against smell loss over a period of at least three months. One study specifically found that patients who combined omega-3 supplements with olfactory training had significantly better odor detection scores than those who trained without supplementation. The research used varying doses, so there’s no single agreed-upon amount, but a standard fish oil supplement providing around 1,000 mg of combined EPA and DHA daily is a reasonable starting point.
Steroid nasal sprays, the kind you’d pick up over the counter for allergies, do not help with post-viral smell loss. Multiple reviews have confirmed they provide no benefit for this type of olfactory dysfunction. However, steroid rinses (where a corticosteroid is dissolved in a saline nasal irrigation) may be helpful. If you’re interested in this route, it typically requires a prescription, as the steroid needs to be mixed into a high-volume sinus rinse rather than simply sprayed.
Managing Distorted Smells
Some people don’t lose their smell entirely. Instead, familiar things smell wrong. Coffee smells like gasoline. Onions smell rotten. Chocolate is unbearable. This condition, called parosmia, happens when damaged olfactory neurons regrow but wire up incorrectly. It’s actually a sign of recovery, though it rarely feels that way.
The distortions are triggered by specific types of molecules, primarily compounds containing sulfur or nitrogen. Common trigger foods include coffee, onions, garlic, eggs, chocolate, and anything that’s been roasted or grilled. Heat is the main amplifier. Warm food releases far more of these volatile compounds into the air than cold food. A roasted chicken might be unbearable, while cold sliced chicken from the same bird is perfectly fine.
Practical strategies that help:
- Eat food at room temperature or cold. The cooler the food, the fewer odor molecules reach your nose.
- Avoid high-heat cooking methods. Frying, grilling, roasting, and barbecuing all trigger the Maillard reaction, a chemical change that produces many parosmia-triggering compounds. Steaming or poaching meats is a better option.
- Watch for browned carbohydrates. Toast, crispy baked bread, and fried potatoes all undergo the same reaction. Removing crusts from bread and skipping the toaster can help.
- Keep a trigger diary. Parosmia triggers vary from person to person. Tracking what sets yours off helps you avoid unnecessary restrictions.
Parosmia typically improves over months as neurons continue to heal and rewire. Continuing olfactory training during this period helps guide that rewiring process.
The Coffee Bean Myth
If you’ve ever shopped for perfume, you’ve probably been offered coffee beans to “reset” your nose between scents. This is a widespread belief in the fragrance industry, but it doesn’t hold up. A controlled study tested whether sniffing coffee beans between fragrance samples improved people’s ability to distinguish new scents. Coffee beans performed no better than sniffing lemon slices or plain air. Your nose naturally recovers from short-term scent fatigue within seconds to minutes on its own. If you feel “nose blind” while testing fragrances, simply stepping away and breathing fresh air for a moment works just as well.
When Recovery Stalls
If your smell hasn’t improved after several months of consistent training, it’s worth seeing an ear, nose, and throat specialist. Among patients whose smell loss persists for 18 months or longer, only about 30 percent experience meaningful spontaneous improvement in the following year. A specialist can perform standardized smell tests to measure exactly where your function stands and determine whether imaging is needed to rule out structural causes like nasal polyps or, rarely, a tumor affecting the olfactory nerve.
Smell loss that appears without an obvious cause, like a recent cold or head injury, deserves particular attention. Over 90 percent of people with early Parkinson’s disease have some degree of olfactory dysfunction, sometimes appearing more than a decade before any movement symptoms. This doesn’t mean unexplained smell loss equals Parkinson’s, but it’s one reason specialists take persistent, unexplained cases seriously, especially when accompanied by sleep disturbances, mood changes, or a family history of the condition.
A Realistic Timeline
If you start olfactory training today, don’t expect results in a week. Most studies measure outcomes at the 12-week mark, and that’s where the clearest improvements show up. Some people notice subtle changes sooner, like catching a faint whiff of something they couldn’t smell before, or finding that one of their training scents starts to register. These small moments are real progress.
For post-viral smell loss that’s lasted a few weeks to a few months, the combination of natural nerve regeneration and active training gives you the best odds. For longer-standing loss, improvement is still possible, but it tends to be slower and more incremental. Consistency matters more than intensity. Two brief sessions a day, every day, for months is the formula that the evidence supports. Skipping days or doubling up sessions doesn’t produce the same results as steady daily practice.