You lost your sense of smell. Maybe it was COVID, maybe another virus, maybe something you can’t quite trace back to a single cause. At first it seemed like a minor inconvenience, and you just assumed it would come back on its own. Then weeks passed. Then months. Your doctor ran some tests, found nothing structurally wrong, and told you to be patient.
So here you are, eating food that tastes like nothing, navigating a world gone flat, and wondering whether this is just your life now. What nobody told you, and what most doctors still don’t mention, is that there’s a structured, evidence-based protocol specifically designed to help the brain rebuild its connection to scent. It’s called olfactory training. And for many people dealing with post-viral smell loss, it works.
What Olfactory Training is and Isn’t
Olfactory training is exactly what it sounds like: a structured, repeated exposure to specific scents, designed to stimulate and rebuild the neural pathways that connect your nose to your brain. It’s not aromatherapy in the casual sense, it’s a rehabilitation protocol. And like any rehabilitation protocol, the results depend heavily on consistency, correct technique, and the right materials for your specific situation.
The basic principle is straightforward. By repeatedly sniffing a defined set of scents in a deliberate, mindful way, you give your olfactory system a reason to rebuild connections that viral infection, illness, or other disruption has weakened. The brain responds to that stimulus over time. Pathways that went quiet start firing again. It does not happen overnight, and it does not happen without effort, but for many people it happens.
The protocol typically involves a small set of distinct scents representing different odor categories, sniffed in a specific sequence, for a specific duration, over a period of weeks. The scents matter. The technique matters. The consistency matters. Which is why simply ordering a smell training kit online and hoping for the best produces results that are, at best, inconsistent.
Where It Came From and What the Research Says
Olfactory training as a formal rehabilitation protocol was pioneered by Dr. Thomas Hummel at the University of Dresden in the early 2000s. His research demonstrated that repeated, structured exposure to specific scents produced measurable improvement in smell function in patients with post-infectious smell loss. That foundational work has since been replicated and expanded across multiple studies, and olfactory training is now recognized in clinical guidelines for smell loss treatment in several European countries.
The research is not perfect. Studies vary in methodology, scent selection, and duration. Not every participant recovers fully, and the degree of improvement differs from person to person. But the overall body of evidence is consistent enough that this is no longer considered experimental. It is a documented, repeatable approach with a real mechanism behind it.
That mechanism is neuroplasticity, the brain’s ability to reorganize and form new neural connections in response to repeated stimulus. Your olfactory system is not a fixed, static structure. It is capable of change. Olfactory training works by giving it a consistent, specific reason to change in the right direction.
For anyone who wants to go deeper into the specific studies, I’ve compiled the most relevant research in the Resources section of this site.
Why Viral-Caused Smell Loss Responds to This Approach
Not all smell loss is the same, and that distinction matters when it comes to recovery potential.
Smell loss that is congenital or caused by structural damage, for example a severe head trauma that physically damages the olfactory nerve or the cribriform plate, presents a fundamentally different challenge than smell loss caused by viral infection. In structural cases the physical pathway itself has been compromised. In post-viral cases, the pathway is typically intact but disrupted. The connection between nose and brain has been weakened, muffled, or temporarily derailed, but the underlying architecture is still there.
That distinction is what makes post-viral smell loss particularly responsive to olfactory training. You are not trying to rebuild something from nothing. You are trying to wake up something that went quiet.
COVID-19 brought this into sharp focus. The scale of post-viral smell loss from the pandemic created both an urgent need for solutions and a significant body of new research. We now understand more about how viral infection disrupts the olfactory epithelium, the tissue lining the nasal cavity that contains the smell receptors, and how that disruption creates the patterns of loss, distortion, and phantom smell that so many people experience. Parosmia, where familiar smells become distorted or unpleasant. Phantosmia, where smells appear that have no source. Hyposmia, a partial reduction in smell sensitivity. Total anosmia, a complete absence of smell.
Each of these presentations is different. Each responds somewhat differently to training. Which is why the scents chosen, the structure of the protocol, and the ability to adjust as you progress all matter considerably more than most people realize when they order a generic kit online.
What Off-the-Shelf Kits Get Wrong
Smell training kits are widely available online. Four small vials, an instruction card, and a general protocol. For the price, they seem like a reasonable place to start, and for some people with mild, straightforward smell loss they may produce some improvement.
The problem is that smell loss is rarely straightforward.
The scents included in generic kits are based on sound research, as they typically reflect the odor categories most studied in olfactory training. That’s a reasonable starting point. The limitation isn’t the scents themselves, it’s that the protocol is fixed. There’s no mechanism for adjusting as your smell changes, improves, or presents new symptoms, and no one interpreting what you’re experiencing along the way.
Olfactory training done correctly is an iterative process. Your responses to specific scents provide information. That information should shape what comes next. A kit cannot do that. A kit gives you the same four vials and the same instruction card regardless of whether you have parosmia, phantosmia, hyposmia, or are three weeks post-viral versus eighteen months out.
The other issue is compliance. Research shows that consistency over time is one of the strongest predictors of improvement in olfactory training. Doing it correctly, regularly, for long enough. That is significantly easier when someone is tracking your progress, adjusting your protocol, and keeping you accountable than when you are working through a generic kit alone with no external structure.
What the Training Actually Involves Day to Day
One of the most common reactions people have when they first hear about olfactory training is surprise at how simple the core practice is. There are no complicated procedures, no expensive equipment, and no significant time commitment. What it requires is consistency and attention.
The core daily practice is straightforward. Each day you work independently with your custom aromatic materials, deliberately sniffing each scent in a structured sequence, for short durations, with focused attention on what you are trying to smell rather than passive exposure. That last part matters more than most people expect. The quality of attention you bring to the practice directly affects its efficacy. This is not something you do while checking your phone.
The sessions are where everything else happens. Reviewing your journal, interpreting what your responses are telling us, adjusting the protocol based on where you are in the process, and working through guided exercises that support and deepen the daily practice in ways that go beyond the sniff ritual itself. There is considerably more to this work than most people anticipate when they first start.
Between formal sessions you keep a smell journal, logging what you notice, what has changed, what smells different than it did, and what remains absent. That log becomes one of the most useful tools in the process. Progress in smell recovery is often nonlinear and subtle. People frequently notice improvement only when they look back at where they started rather than comparing day to day. The journal makes that visible.
The full protocol runs eight weeks. Long enough for meaningful neurological change to occur. Short enough to stay motivated and on track.
Who This Is Likely to Help and Who It Isn’t
Olfactory training is not a universal solution, and I would rather be straight with you about that upfront than have you invest time and money in something that isn’t the right fit.
The people most likely to benefit are those whose smell loss stems from viral infection, illness, aging, or environmental factors. In these cases the olfactory pathway is typically disrupted rather than structurally damaged, which means the underlying architecture for recovery is still intact. Post-COVID smell loss, post-viral smell loss from other infections, gradual age-related decline, and smell changes from environmental exposure all fall into this category.
The people this work is less likely to help are those whose smell loss is congenital or the result of structural damage to the nasal cavity, tearing of the olfactory nerves, or brain injury to areas that process scent. If that is your situation, I will tell you honestly on our discovery call rather than take your money.
One thing worth knowing: the research suggests that earlier intervention produces better outcomes. The longer smell loss goes unaddressed, the harder recovery becomes. If you have been waiting to see if it resolves on its own, that patience may be working against you.
If you are unsure whether your situation is a good fit, that uncertainty is exactly what the DISCOVERY CALL is for. Bring your questions, your history, and your skepticism. We will figure it out together.
Where to Go From Here
If anything in this piece describes your experience, the next step is a free 15-minute DISCOVERY CALL. No pitch, no pressure. Just an honest conversation about whether this protocol is the right fit for what you are dealing with.
If you are not quite ready for that and want to understand the science more deeply first, the Why Scent Works page is a good next stop. Folow these links to better understand the LiftAromatics approach to Remote Smell Training.
And if you have been waiting to see if your smell comes back on its own, consider this your nudge to stop waiting.