Nasal strips have become one of the most visible accessories in running, right alongside GPS watches and foam rollers.
You’ve probably seen them on the starting line of your last race, or noticed a training partner wearing one on a Saturday long run.
The promise is simple: open your nasal passages, breathe easier, run better.
But the research on whether nasal strips actually improve running performance tells a more complicated story than the packaging suggests, and the answer depends on a question most runners haven’t thought to ask about their own anatomy.
So, in this article you’re going to learn the research-backed practical advice on…
- How nasal strips change your airflow and what that actually means for performance
- What two major research reviews say about nasal strips and VO2max
- Why strips feel like they’re working even when performance data says otherwise
- The specific nasal condition that determines whether strips will genuinely help you
- Whether internal nasal dilators outperform the external strips you’re used to seeing
- How training your nasal breathing delivers benefits no strip can replicate
What Do Nasal Strips Actually Do to Your Airway?
External nasal strips like Breathe Right use a spring-loaded adhesive band to physically pull open the nasal valve, the narrowest point inside your nose.
Nasal strips increase maximum inspiratory nasal airflow by 14.9% and boost nasal ventilation by 14.3%, while reducing nasal resistance by about 0.5 cm H₂O/Lps from an average of 5.5.
That 15% airflow increase is meaningful in terms of what you feel when you breathe in.
One practical consequence of this reduced resistance is a delayed switch from nasal-only breathing to mouth breathing during exercise.
Nasal strips delay the onset of oro-nasal breathing by 15.2%, meaning you stay breathing through your nose longer as effort increases.
For runners, that means you can maintain nasal breathing at slightly higher intensities before your body automatically switches to mouth breathing to meet oxygen demand.
The question is whether that mechanical change translates into anything you’d notice on a race clock.
Do Nasal Strips Improve VO2max or Endurance?
Despite the measurable improvement in airflow, the performance data tells a different story.
A 2020 meta-analysis of 19 articles covering 168 participants found no statistically significant improvement in VO2max (p=0.19), heart rate (p=0.99), or perceived exertion (p=0.56) with external nasal dilator strips in healthy individuals.
A 2022 systematic review of 11 articles did find a small signal favoring nasal dilators for VO2 and perceived exertion compared to placebo.
But the researchers rated their certainty of evidence as “very low,” which in research terminology means the finding could easily disappear with better-designed studies.
Nasal strips improve how much air enters your nose, but that additional airflow doesn’t translate into more oxygen reaching your muscles or a lower heart rate during running.
The gap between “more air through your nose” and “faster or longer running” exists because your body has a highly efficient backup system already in place: your mouth.
When nasal airflow becomes insufficient during hard running, you automatically switch to mouth breathing, which delivers far more air volume than your nose ever could, strip or no strip.
Why Do Nasal Strips Feel Like They’re Working When the Data Says Otherwise?
If you’ve ever worn a nasal strip on a run and thought it made a noticeable difference, you’re not imagining things.
The strip genuinely changes what breathing feels like, even though it doesn’t change performance outcomes.
That 15% increase in nasal airflow creates an immediate sensation of easier breathing at the start of a run.
Your inhales feel less restricted, and the reduced nasal resistance means each breath requires slightly less effort to pull through your nose.
The delayed switch to mouth breathing reinforces this perception.
Staying nasal-breathing longer feels more controlled and more comfortable than gasping through your mouth, especially during the first mile when your body is still settling into effort.
Sports psychologist Jeffrey Simons has pointed out that the placebo effect in athletic performance is well-documented and powerful.
When runners believe a product is helping them breathe better, they often report feeling less fatigued and more confident in their pacing.
The distinction matters: “breathing feels easier” and “you’re running faster or longer” are two different outcomes that runners consistently conflate.
If wearing a nasal strip makes your easy runs feel more pleasant, that’s a legitimate reason to use one.
Just know that the comfort benefit is what you’re getting, not a performance advantage.
Which Runners Actually Benefit from Nasal Strips?
The blanket statement that nasal strips don’t improve performance has one important exception, and it’s based on anatomy, not fitness.
A 2023 study of 38 endurance athletes found that internal nasal dilators improved performance in athletes with nasal valve compromise, but had no effect on athletes with normal nasal patency.
Nasal valve compromise means the structures inside your nose partially collapse or stay narrowed during hard breathing, restricting airflow beyond what’s normal.
For runners in this group, a nasal strip or dilator isn’t adding a marginal 15% to already-adequate airflow.
It’s restoring airflow that their anatomy is restricting.
If your nasal passages are structurally compromised by a deviated septum, chronic congestion, seasonal allergies, or nasal valve collapse, strips may provide a real functional benefit that healthy-nosed runners won’t experience.
You can do a rough self-assessment at home.
- Breathe in sharply through your nose while looking in a mirror. If your nostrils visibly collapse inward, you likely have some degree of nasal valve weakness.
- Check whether one nostril consistently feels more blocked than the other, even when you’re not congested. Persistent one-sided restriction often signals a structural issue.
- Notice whether your nasal breathing becomes significantly more difficult during the first 10 minutes of running compared to standing still. A dramatic difference suggests your nasal valve is struggling under the increased airflow demand.
If any of those apply, nasal strips are worth testing in training.
Try them on several easy runs before using them in a race, because the adhesive can loosen with sweat and the fit varies between brands.
Are Internal Nasal Dilators More Effective Than External Strips?
External strips like Breathe Right pull the nasal valve open from the outside using adhesive on the bridge of your nose.
Internal dilators like Turbine, Intake, and Nas-air hold the nasal passages open from the inside, sitting directly inside your nostrils.
A 2019 study found that internal nasal dilators (Nas-air) produced a statistically significant reduction in perceived fatigue during exercise (p=0.000).
That fatigue perception finding is stronger than anything external strips have produced in controlled research.
The mechanical advantage of internal dilators comes from how they maintain contact with the nasal valve.
An external strip relies on adhesive that can weaken with sweat, humidity, and facial movement during hard breathing.
The trade-off is comfort.
Internal dilators take some getting used to, and finding the right size matters more than it does with external strips.
They’re also harder to find in stores and typically cost more per use than a box of Breathe Right strips.
If you’ve identified yourself as someone with nasal valve compromise and want to test a dilator for running, internal options have slightly better research support.
Start with training runs to find a brand and size that stays comfortable over 30 or more minutes before committing to one for race day.
Does Nasal Breathing Itself Improve Running Performance?
The bigger opportunity behind the nasal strip debate has nothing to do with what you stick on your nose.
Nasal breathing during running triggers physiological responses that mouth breathing doesn’t, regardless of whether you’re wearing any kind of dilator.
Breathing through your nose increases production of nitric oxide, a vasodilator that improves oxygen delivery to your muscles.
Runners who trained exclusively through their nose for 6 months achieved the same VO2 at a lower respiratory rate than they started with.
Separate research found that nasal breathing requires less total oxygen at the same exercise intensity compared to mouth breathing.
There’s also a protective component.
Exercise-induced bronchoconstriction, the chest tightness and wheezing some runners experience during hard efforts, has been linked to chronic mouth breathing during endurance exercise.
Nasal breathing filters, warms, and humidifies incoming air before it reaches your lower airways, reducing the irritation that triggers bronchospasm.
Training your nasal breathing at easy pace creates a lasting physiological adaptation that no external device can replicate.
The practical application is simple.
On your easy runs, make a conscious effort to breathe only through your nose.
If you can’t maintain nasal breathing, you’re probably running too fast for what should be an easy effort.
At threshold pace and above, mouth breathing takes over naturally, and that’s exactly what should happen.
Your body needs the higher air volume that only mouth breathing can provide at those intensities.
The goal is to build the adaptation at easy pace so your respiratory system becomes more efficient across all efforts.
| Approach | Evidence Strength | Who Benefits | Recommendation |
|---|---|---|---|
| External nasal strips | Meta-analysis: no performance improvement in healthy runners | Runners with nasal valve compromise, deviated septum, or chronic congestion | Test in training first if you have a structural nasal issue. Skip if your nasal passages are normal. |
| Internal nasal dilators | Significant reduction in perceived fatigue (p=0.000). Stronger signal than external strips. | Same subgroup: runners with restricted nasal patency | Better research support than external strips. Find the right size before race day. |
| Nasal breathing training | 6-month adaptation improves respiratory efficiency. Increased nitric oxide production. | All runners, regardless of nasal anatomy | Practice nasal-only breathing on easy runs. Let mouth breathing happen naturally at harder efforts. |
