General questions

  • Yes! You can use all NOSA products if pregnant.

All NOSA products are recommended from the age of 12. 

All unopened packages have a shelf life of 2 years, the date is displayed on the packaging. An opened package is recommended to be used within 2 months.

You can buy our 7-packs (intended for private customers) here in our webshop. There are also various e-pharmacies selling the products in Europe, which you can find by searching for the product.

You can order bigger packages of NOSA menthol plugs and NOSA microbial control intended for B2B usage, through any of our distributors. NOSA allergy filter is only available for consumers (7-pack). If you are interested in buying NOSA smell training as a company, feel free to contact us at customerservice@nosaplugs.com.

All NOSA products are single-use products and are not recommended for reusage. The devices works as intended for up to 8 hours, After finished usage, the product is recycled as plastic.

NOSA smell training

Olfactory training, also known as smell training, is an effective method for improving people’s sense of smell. By regularly exposing themselves to different scents and concentrating on identifying them, individuals can improve their ability to recognize different smells.

Smell training has become particularly popular in healthcare for people with an impaired sense of smell, such as those suffering from anosmia (complete loss of smell) or hyposmia (impaired sense of smell).

Instructions for use: Upon opening the box, familiarize yourself with the calendar displayed on the lid. Plan for four sessions per day, five days a week – two in the morning and two in the evening. Always use the devices as instructed. 

Step 1: Always begin by cleaning your hands. This ensures that you avoid any potential irritation or infection. 

Step 2: Take out the first two scents according to the calendar and carefully insert the first scented plug into your nose. Apply gently into the nostrils until the bracket meets the nasal wall. 

Step 3: Set a timer for 10 minutes. During this time, focus on the scent. Visualization can help reinforce your memory of the scent. 

Step 4: Once the first session is complete, carefully remove the device from your nose and repeat steps 1-3 above with the next scent according to the calendar. 

Step 5: Follow the same steps for the evening sessions.

Read our full instructions for use for NOSA smell training here. 

The prescribed treatment period spans 8 weeks, during which the patient is exposed to four distinct scents daily for a cumulative duration of 40 minutes. This exposure is split into four 10-minute sessions, two in the morning and two in the evening. Each session presents one of the different scents, each lasting for a period of 10 minutes.

The kit comes with 10 boxes with 10 different scents, each containing 16 noseplugs of the scents; Lemon, Strawberry, Orangea, Vanilla, Melon, Rosemary, Lavender,  Menthol, Cherry and Cola. Fruity and spicy fragrances are to be recommended for a smell training program, and the nose plugs lets the patient breathe easily through the product. The patient can simply train while breathing wherever they want, whenever they want.

Yes, you will be able to purchase additional scents from our webshop that you can switch to any existing scent-box in your “NOSA smell training set”. New scents will be released continuously, so stay tuned on our website!

The sense of smell plays a crucial role in our ability to experience and enjoy different smells and tastes. Smell training has been shown to be effective in stimulating the olfactory receptors and promoting the recovery of lost olfactory ability.

There are several reasons why you should consider training your sense of smell;

  • Exercising the sense of smell improves the experience of food and drink by enhancing flavors.

  •  It can help to increase awareness of your surroundings and experience different scents in a deeper way.

  • Losing your sense of smell could also be dangerous, since it helps us to recognize hazardous situations. For example, sensing the smell of fire or gas, or sensing bad food. 

A reduced sense of smell has also shown to affect well-being, by causing depression and a negative impact on social relations, appetite and lust.


About half of all people who get covid-19 experience a short or long-term loss of smell. One year after recovery, 10 percent state that they still have problems – but if you actually measure the sense of smell, it turns out to be 20 percent that still have a reduced sense of smell.¹

Several studies have shown that a large number of patients have not recovered their full sense of smell after covid. A study in the US showed that around 25% were still affected by a reduced, or altered, sense of smell after recovery.² 

There are more possible reasons for losing your sense of smell except for a covid infection. 

Hormonal imbalances can affect the sense of smell because hormones play an important role in regulating our sensory system. When the hormones are out of balance, it can affect the mucous membranes in the nose and thereby impair the sense of smell. Some neurological diseases, including Alzheimer’s and Parkinson’s, can also affect the parts of the brain responsible for the sense of smell, which can result in loss of smell.

Anyone that wishes to increase their sense of smell, or that suffers from hyposmia, anosmia or parosmia. The product is recommended from 12 years of age.

NOSA has developed an app that will help you keep track of your training by:

Scheduling and Reminders: Provide users with a structured calendar to organize their smell training sessions and offer reminders, fostering a consistent routine.

Visualization: Utilize images to bolster the user’s experience and engagement during the training sessions.

Feedback: Allow users to document subjective feedback on their sense of smell, quality of life, and progress over time for personal reflection and self-awareness.

This application is intended for well-being and lifestyle purposes only. Users should not replace or substitute professional medical advice or treatment with the insights gathered by the use of this app.

The primary objective of NOSA smell training app is to promote well-being and personal awareness of one’s olfactory senses. It is not designed, nor should it be used, for the diagnosis, prevention, monitoring, treatment, or alleviation of any medical condition or disease. In alignment with MDR EU 2017/745.

Explore the app here.

NOSA allergy filter

  • NOSA allergy filter contains a filter media that filters out particles in the size range of PM10 and larger, reducing the amount of allergen particles that enter the nose. The sealing design (sealing skirt) forces the airflow to pass through the filter media inside the device. It is important that the sealing skirt seals tight against the inside of your nose, so that no allergens get past the filter media. 

Allergic reactions is due to an inflammation of the nasal membranes (allergic rhinitis) and can be recognized by sneezing, nasal congestion, nasal itching, and rhinorrhea.¹

NOSA allergy filter reduces the amount of allergens that enter the nose. A reduced exposure to allergens reduces the risk of allergic symptoms.

NOSA allergy filter is a medical device class 1 in Europe and has been clinically evaluated. External lab tests have shown that particles are effectively filtered out when inhaled through the product. NOSA allergy filter is tested against particles in the size range of pollen, pet dander, dust & mold.

Since a lot of the allergic symptoms are due to an inflammation of the nasal membranes, your main focus should be to protect your nose. Preferably, breathe through your nose while using nasal filters to reduce the amount of allergens that reach your respiratory system.

Allergic Rhinitis is an inflammation of the nasal membranes and can be recognized by sneezing, nasal congestion, nasal itching, and rhinorrhea.¹

One good way to prevent allergic rhinitis is to avoid the allergens that cause the allergic reaction as much as possible. However, this is easier said than done. Allergens from pollen, dust and pet dander could be present in the air and on surfaces that we are exposed to every day.

See the descriptive image below. 
NOSA filter consists of a “filter house” and a “sealing skirt”. The filter house should fill your whole nostrils. The function of the sealing skirt is to seal and make sure no air leaks through on the edges.
Match your nostrils to the size of the filter house.

If you are unsure of which size you should choose, try our filter kit!

NOSA allergy filter sizes chart

NOSA allergy filter is a single-use product that can be used for up to 8 hours. After usage, the product is recycled as plastic.

The product is made of TPE plastic and a PP filter media.

Nosa Odor Control

NOSA odor control plugs have undergone rigorous testing to assess its safety. Results from cytotoxicity tests revealed no evidence of toxic effects. Additionally, tests for skin irritation showed no signs of irritation. The user can be confident in the quality and safety of NOSA odor control plugs.

No, NOSA odor control plugs will not filter or block microbials. However, NOSA microbial control is developed to reduce the exposure of viruses and bacteria, by inactivating viruses and killing bacteria that get in contact with the device.

Of course, since the product is easy to breathe through, you can also wear a mask without any difficulty. However, a few users with sensitive eyes have reported some discomfort due to the menthol fragrance leaking through the upper part of the mask from the exhaled air. If this occurs, it is recommended to adjust the mask to prevent any leakage near the eyes, thereby minimizing any potential irritation.

All NOSA products are single-use products and are not recommended for reusage. The device works as intended for up to 8 hours, After finished usage, the product is recycled as plastic.

Nosa Microbial Control

The product design forces the air to pass through the lamella structure of the device  where it inactivates viruses and kills bacteria that get in contact with the product. This is made possible due to the silver phosphate particles infused into the material.

Inside the nose is a sensitive area called the mucous membrane. Viruses and bacteria can enter the body and infect humans through this area. A reduced exposure to viruses and bacteria in the nose has been shown to reduce the risk of respiratory infections. NOSA microbial control is tested against many of the most common flu viruses.

The latest research shows that there are two types of cells inside the nose that are the likely entry point for COVID-19. These cells work as “viral entry receptors” and are highly accessible to the corona virus because of the location in the nose.³

  1. Years of product development resulted in a patented design that:

    Reduces viruses
    Reduces bacteria
    Is easy to breathe through
    Is discreet and comfortable
    Has an innovative design
    Can be used for up to 8 hours

  1. Not sure how to place NOSA microbial control in your nose correctly?
    Watch the instruction video here!

    Hold the product bracket between your index fingers and thumbs and carefully place the product in your nostrils until the bracket meets the nasal wall.

    Carefully press the product upwards with your index finger and thumb until it is placed correctly and does not fall out.

    If you feel that the product is placed wrong, try to adjust the product again until it feels comfortable. Do not use if any discomfort arises.

The corona virus is one of the most common flu viruses right now, together with rhinovirus, norovirus and adenovirus among others. The variants associated with COVID-19, for example “Delta” and “Omicron” are mutations of the coronavirus and it is known that mutations can be more contagious to humans than previous variants. There is much to suggest that the new mutations of the coronavirus in the future will be part of the recurring pool of viruses.²

There are two types of cells in the nose that the coronavirus primarily attacks to infect the body. These cells work as “viral entry receptors” and are highly accessible to the corona virus because of the location in the nose.³

Tests performed by external laboratories show that NOSA microbial control can reduce Coronavirus, Rhinovirus and Norovirus up to 93% and Staphylococci (MRSA), Pneumococci and E-coli up to 99%.

The face mask most commonly used, the surgical mask, aims to reduce the transmission of infectious particles from the user to the environment through exhalation.⁴ In other words, it aims to protect others from your potential infectious particles. The only respiratory protection intended to protect the user against viruses and bacteria is FFP3, the highest class of filters, which is often used within the chemical industry.⁵ 

NOSA microbial control is designed to reduce the user’s exposure of viruses and bacteria by inhalation through the nose. A reduced exposure of viruses and bacteria reduces the risk of respiratory infections.

The device has been tested against some of the most common viruses and bacteria, such as Coronavirus, Rhinovirus and Norovirus as well as Staphylococcus including MRSA, pneumococci and E-coli.

Yes, you can explore all our Distributors for NOSA microbial control on the distributors page

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