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CLear O2 15L Compressed Pure Oxygen

CLear O2 15L Compressed Pure Oxygen

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  • ✔️ Delivers 99%+ pure oxygen for rapid breathlessness relief
  • ✔️ Supports faster recovery after intense physical exercise
  • ✔️ Aids acclimatisation at high altitude destinations
  • ✔️ Portable 15L canister — fits easily in any bag
  • ✔️ No prescription needed — available OTC for adults

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What Is a Compressed Oxygen Canister and How Can It Help You?

 

Breathlessness can catch you off guard — whether you're pushing through a tough workout, adjusting to high altitude on a hiking trip, or simply feeling a little short of breath after a long day. The compressed oxygen canister CLear O2 15L from Cured Pharmacy offers a convenient, portable source of supplemental oxygen you can carry with you and use whenever you need it. Each canister contains 15 litres of pure oxygen at a concentration of 99% or above, ready to inhale through the included mask or nozzle. At just £19.99, it's an accessible option for those who want a practical, on-the-go solution.

Supplemental oxygen has a well-established role in supporting people who experience temporary drops in blood oxygen saturation — for example, during intense physical activity or at altitude. It is not, however, a substitute for medically prescribed oxygen therapy. If you have a diagnosed respiratory condition, always follow your GP's guidance. For general wellness and short-term breathlessness relief, CLear O2 15L is a straightforward, easy-to-use option. You might also find it useful to browse our First Aid range for other products that support your health on the go.

 

How Does CLear O2 15L Compressed Oxygen Work?

 

When you inhale supplemental oxygen, the concentration of oxygen in your airways increases above the normal atmospheric level of approximately 21%. This higher concentration is absorbed across the alveolar membrane in your lungs and into your bloodstream, raising your blood oxygen saturation (SpO2). The result? Your body gets more of what it needs to function — faster.

  • Oxygen is absorbed through the alveoli in the lungs into the bloodstream.
  • Haemoglobin in red blood cells binds to the additional oxygen molecules.
  • Oxygen is transported to muscles, organs, and tissues throughout the body.
  • Cells use oxygen to produce energy (ATP) via aerobic respiration, reducing fatigue.
  • Blood oxygen saturation levels rise, which can relieve the sensation of breathlessness.

 

Who Should Use CLear O2 15L Compressed Oxygen?

 

This product is designed for adults who need short-term, supplemental oxygen support. It is not intended for people with chronic respiratory conditions who require continuous prescribed oxygen. Think of it as a practical aid for specific situations rather than an ongoing treatment.

CLear O2 15L may be suitable for you if you are:

  • Travelling to high-altitude destinations and experiencing altitude-related breathlessness.
  • An athlete or fitness enthusiast looking to support recovery after intense exercise.
  • Someone who occasionally experiences mild, temporary breathlessness not linked to a diagnosed condition.
  • A traveller wanting a portable oxygen source for emergencies or long-haul journeys.

 

How Does CLear O2 15L Compare to Other Portable Oxygen Options?

 

Feature CLear O2 15L (Cured Pharmacy) Standard Portable Oxygen Concentrator
Oxygen concentration 99%+ pure oxygen 87–95% (varies by device)
Portability Lightweight canister — fits in a bag Heavier unit — requires carrying case
Prescription required No — available OTC Usually yes, for medical use
Cost £19.99 per canister £500–£2,000+ for device

 

How Should You Store CLear O2 15L and Is It Clinically Suitable for You?

 

Store your compressed oxygen canister upright in a cool, dry location, away from direct sunlight, heat sources, and open flames. Oxygen supports combustion, so it must never be stored near anything flammable. Keep it out of reach of children and do not puncture or incinerate the canister. Check the valve before each use to ensure it is functioning correctly.

Clinical suitability depends on your individual health status. If you have any heart or lung condition, are pregnant, or are taking medicines that affect your respiratory system, speak to your pharmacist or GP before use. For those managing ongoing health conditions, our Electrical Health and Diagnostic range includes pulse oximeters that can help you monitor your blood oxygen levels at home.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

CLear O2 15L Compressed Pure Oxygen specifications
Treatment category Respiratory support / Supplemental oxygen
Mechanism of action Increases inspired oxygen concentration, raising blood oxygen saturation via pulmonary gas exchange
Effective for Temporary breathlessness, altitude acclimatisation, post-exercise recovery
Suitable for Adults seeking short-term supplemental oxygen
Active ingredient Oxygen (O2) 99%+
Pack size 15 litres per canister
UK classification General Sale / OTC
Preparation Compressed gas in canister with mask/nozzle
Route of administration Inhalation

Specifications of CLear O2 15L Compressed Pure Oxygen

 

What Is CLear O2 15L and What Is It Used For?

 

CLear O2 15L is a portable canister of compressed pure oxygen, containing 15 litres of oxygen at a concentration of 99% or above. It is intended for inhalation by adults who need short-term supplemental oxygen. Common uses include relief of temporary breathlessness, support during acclimatisation to high altitude, and recovery assistance after strenuous physical activity. It is not a medical oxygen device and is not intended to treat, diagnose, or manage any diagnosed respiratory or cardiovascular condition.

 

What Do You Need to Know Before Using CLear O2 15L?

 

Before using this product, read the following carefully. There are situations where supplemental oxygen from an OTC canister is not appropriate.

Do not use CLear O2 15L if you:

  • Have been prescribed medical oxygen therapy by your GP or respiratory specialist — always follow your prescribed treatment plan.
  • Have a diagnosed condition such as COPD, hypercapnic respiratory failure, or any condition where high-concentration oxygen may be harmful.
  • Are under 18 years of age.
  • Are pregnant or breastfeeding, unless advised by a healthcare professional.
  • Have a known hypersensitivity to any component of the product.

Warnings and precautions:

  • Oxygen supports combustion — never use near open flames, cigarettes, or heat sources.
  • Do not puncture, crush, or incinerate the canister.
  • Do not use continuously for extended periods without medical supervision.
  • If breathlessness is persistent, unexplained, or worsening, seek urgent medical advice rather than relying on supplemental oxygen.
  • Store and use in a well-ventilated area.

Known drug interactions:

  • No clinically significant drug interactions are known for short-term inhalation of supplemental oxygen at OTC concentrations.
  • If you are taking bleomycin (a chemotherapy medicine), high-concentration oxygen may increase the risk of pulmonary toxicity — do not use without specialist advice.

 

How Should You Use CLear O2 15L?

 

Using CLear O2 15L is straightforward, but it's important to follow the steps correctly to get the most benefit and avoid wasting the canister's contents.

  1. Remove the protective cap from the canister valve.
  2. Attach the mask or nozzle securely to the valve outlet.
  3. Hold the canister upright at all times during use.
  4. Place the mask over your mouth and nose, or position the nozzle just in front of your mouth.
  5. Press the valve button to release a burst of oxygen.
  6. Inhale slowly and deeply through your mouth as you press the valve.
  7. Hold the breath briefly, then exhale normally.
  8. Repeat as needed, typically 1 to 3 inhalations per session.
  9. Replace the cap after use and store the canister safely.
Indication Age Group Dose Frequency
Breathlessness after exercise Adults (18+) 1–3 inhalations (1–2 seconds each) As needed, up to several times daily
Altitude acclimatisation Adults (18+) 2–3 inhalations As needed at altitude
General breathlessness relief Adults (18+) 1–2 inhalations As needed — seek medical advice if persistent

 

What Are the Possible Side Effects of CLear O2 15L?

 

Side effects from short-term, intermittent use of supplemental oxygen at OTC concentrations are uncommon. However, you should be aware of the following.

Common side effects:

  • Mild dryness of the mouth or throat after inhalation.
  • Slight dizziness if used too rapidly or in excess.
  • Mild headache in some individuals.

Less common side effects:

  • Nausea, particularly if oxygen is inhaled very quickly.
  • Ear discomfort if the mask is held too tightly against the face.
  • Skin irritation around the mouth or nose from prolonged mask contact.

If you experience chest pain, worsening breathlessness, confusion, or any serious symptom after use, stop immediately and call 999 or go to your nearest A&E. These symptoms are not expected from OTC supplemental oxygen and may indicate an underlying medical emergency. You can also find supportive products in our Vitamins and Supplements range to support general respiratory wellness alongside healthy lifestyle habits.

 

How Should You Store CLear O2 15L?

 

  • Store upright in a cool, dry place at room temperature (below 50°C).
  • Keep away from direct sunlight, radiators, and other heat sources.
  • Never store near open flames, cigarettes, or flammable materials.
  • Keep out of reach and sight of children.
  • Do not puncture, crush, or dispose of in fire — even when empty.
  • Check the valve and canister for damage before each use.
  • Dispose of responsibly in accordance with local council guidelines for pressurised containers.

If you're managing a broader health toolkit at home, our Cold and Flu range includes products that can help you manage respiratory symptoms during illness, alongside your supplemental oxygen canister.

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy CLear O2 15L compressed oxygen online in the UK?

You can buy CLear O2 15L directly from Cured Pharmacy online at curedpharmacy.com. No prescription is required, and it is dispatched with fast UK delivery to your door. It is available at £19.99 per canister, making it one of the more accessible portable oxygen options on the UK market.

How does a compressed oxygen canister work in the body?

When you inhale from a compressed oxygen canister, the concentration of oxygen entering your lungs rises well above the normal atmospheric level of around 21%. This oxygen crosses the alveolar membrane into your bloodstream, where haemoglobin carries it to your muscles and organs. The result is a rapid increase in blood oxygen saturation, which can relieve breathlessness and reduce fatigue.

How do I use CLear O2 15L step by step?

Remove the cap, attach the mask or nozzle to the valve, and hold the canister upright. Press the valve to release oxygen while inhaling slowly and deeply through your mouth. Take 1 to 3 inhalations per session, hold briefly, then exhale normally before replacing the cap.

How many doses does a 15L oxygen canister provide?

A 15L canister typically delivers approximately 50 to 60 one-second bursts of oxygen, though this varies depending on how deeply and how long you inhale each time. For most users taking 2 to 3 inhalations per session, this equates to roughly 15 to 20 uses. It is designed for short-term, intermittent supplemental use rather than continuous therapy.

What is the best time to use CLear O2 15L?

Use CLear O2 15L whenever you experience temporary breathlessness — for example, immediately after intense exercise, upon arriving at a high-altitude location, or during any situation where you feel short of breath. There is no fixed time of day; it is designed to be used on demand as symptoms arise. Always seek medical advice if breathlessness is persistent or unexplained.

What are the side effects of using a compressed oxygen canister?

Side effects from short-term use are uncommon but can include mild dryness of the mouth or throat, slight dizziness if used too quickly, or a mild headache. Nausea is less common but possible if oxygen is inhaled very rapidly. If you experience chest pain, confusion, or worsening breathlessness, stop use immediately and seek urgent medical attention.

How do I manage side effects of CLear O2 15L?

To minimise side effects, inhale slowly and steadily rather than taking rapid, forceful breaths. Limit each session to 1 to 3 inhalations and allow time between uses. If dryness is bothersome, sipping water after use can help. For any persistent or concerning symptoms, contact your pharmacist or GP.

Who is CLear O2 15L suitable for?

CLear O2 15L is suitable for adults aged 18 and over who need short-term supplemental oxygen — for example, those travelling to high-altitude destinations, athletes recovering after intense training, or individuals experiencing occasional mild breathlessness. It is not suitable for people with diagnosed respiratory conditions such as COPD or hypercapnic respiratory failure, who should follow their prescribed treatment. Always speak to your GP if you are unsure whether this product is right for you.

Can I use CLear O2 15L if I have asthma?

If you have asthma, you should speak to your GP or pharmacist before using any supplemental oxygen product, including CLear O2 15L. Asthma attacks require prescribed reliever inhalers — supplemental oxygen from an OTC canister is not a substitute for your prescribed treatment. In an acute asthma attack, call 999 immediately.

What are alternatives to a compressed oxygen canister?

Alternatives include prescribed home oxygen concentrators for people with chronic respiratory conditions, or breathing exercises recommended by the NHS for managing breathlessness. For altitude sickness specifically, the NHS recommends descending to a lower altitude as the primary treatment. You can also explore our Ear, Nose and Throat range for products that support respiratory comfort.

Is CLear O2 15L safe to use on a plane?

Pressurised gas canisters are subject to airline regulations and are generally not permitted in aircraft cabins or hold luggage — you should check with your airline before travelling. If you require supplemental oxygen during a flight due to a medical condition, contact your airline in advance as they may be able to provide medical oxygen on board. Do not attempt to bring a pressurised canister onto a flight without prior airline approval.

How long can you use CLear O2 15L for?

CLear O2 15L is intended for short-term, intermittent use and is not designed for continuous or long-term oxygen therapy. If you find yourself relying on supplemental oxygen regularly over an extended period, this is a sign that you should seek medical evaluation. Persistent breathlessness or low blood oxygen saturation requires proper diagnosis and treatment from a healthcare professional.

Can I use CLear O2 15L during sport or exercise?

Yes, CLear O2 15L can be used before or after exercise to support recovery and relieve breathlessness following intense physical activity. It is not intended for use during active exercise, as handling a canister while moving is impractical and potentially unsafe. Many athletes use supplemental oxygen as a recovery aid between training sessions or competitions.

What are the latest studies on supplemental oxygen for sport and altitude?

Research published in sports medicine literature suggests that inhaling supplemental oxygen after high-intensity exercise can accelerate recovery by restoring blood oxygen saturation more quickly than breathing ambient air alone. For altitude sickness, the NHS and wilderness medicine guidelines confirm that supplemental oxygen can temporarily relieve symptoms while descent is arranged. However, it is not a long-term solution and should not delay appropriate medical care. You can find further health monitoring tools in our Electrical Health and Diagnostic range, including pulse oximeters.

What happens if I use too much oxygen from a canister?

Using supplemental oxygen in excess of what is needed is unlikely to cause serious harm in healthy adults during short-term OTC use, but it may cause dizziness, headache, or nausea. In people with certain conditions such as COPD, high-concentration oxygen can suppress the respiratory drive — this is why those with chronic respiratory conditions must not use OTC oxygen without medical supervision. Always use the minimum number of inhalations needed to relieve your symptoms.

How Should You Use CLear O2 15L Compressed Pure Oxygen?

Using CLear O2 15L correctly ensures you get the most benefit from each canister and avoid wasting the contents. Always read the label before first use and check the valve and canister for any visible damage.

What Is the Correct Dose of CLear O2 15L Compressed Pure Oxygen?

There is no single fixed dose for supplemental oxygen from an OTC canister — the appropriate number of inhalations depends on your situation and how quickly your breathlessness resolves. As a general guide, 1 to 3 inhalations per session is sufficient for most adults. Do not exceed this without medical advice.

When Is the Best Time to Use CLear O2 15L Compressed Pure Oxygen?

CLear O2 15L is designed for on-demand use — there is no fixed time of day. Use it as soon as you notice breathlessness, whether that's immediately after a workout, upon arriving at altitude, or during any moment when you feel short of breath. The canister is compact enough to carry in a gym bag, rucksack, or travel kit, so it's always available when you need it most.

How Long Can You Use CLear O2 15L Compressed Pure Oxygen For?

CLear O2 15L is intended for short-term, intermittent use only. Each 15L canister provides a finite number of inhalations and is not designed for continuous or prolonged oxygen therapy. If you find that you are using supplemental oxygen frequently or that your breathlessness is not improving, this is a signal to seek medical advice rather than continue self-treating.

Persistent or worsening breathlessness can be a sign of an underlying condition that requires proper diagnosis and treatment from your GP or a respiratory specialist. Do not use this product as a substitute for prescribed medical oxygen or any other prescribed respiratory treatment.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of CLear O2 15L Compressed Pure Oxygen?

For the vast majority of adults using CLear O2 15L as directed, side effects are mild and short-lived. The most commonly reported effects relate to the drying nature of inhaled oxygen rather than any toxic effect of the gas itself.

  • Dryness of the mouth, throat, or nasal passages after inhalation.
  • Mild dizziness, particularly if oxygen is inhaled too quickly or in excess.
  • Mild headache following use.

What Are the Less Common Side Effects of CLear O2 15L Compressed Pure Oxygen?

Less common side effects are unlikely with short-term, intermittent use at OTC concentrations, but they can occur in some individuals, particularly those who are sensitive or who use the product incorrectly.

  • Nausea, especially if oxygen is inhaled very rapidly or in large quantities.
  • Skin irritation or mild pressure discomfort around the mouth or nose from prolonged mask contact.
  • Ear discomfort if the mask is held too tightly against the face.
  • Feeling of lightheadedness or mild confusion if used excessively.

What Are the Serious Side Effects of CLear O2 15L Compressed Pure Oxygen?

Serious side effects from OTC supplemental oxygen use in healthy adults are rare. However, in people with certain underlying conditions — particularly COPD or hypercapnic respiratory failure — high-concentration oxygen can suppress the hypoxic respiratory drive, potentially causing a dangerous reduction in breathing rate. This is why CLear O2 15L is not suitable for people with these conditions without medical supervision.

If you experience any of the following after use, stop immediately and seek urgent medical attention by calling 999 or going to your nearest A&E:

  • Chest pain or tightness.
  • Worsening breathlessness rather than improvement.
  • Confusion, drowsiness, or loss of consciousness.
  • Bluish discolouration of the lips or fingertips (cyanosis).

What Should You Do If You Experience Side Effects of CLear O2 15L?

For mild side effects such as dryness or dizziness, simply stop using the canister and rest. Sipping water can help relieve throat dryness. If dizziness occurs, sit or lie down in a safe position until it passes. Reduce the number of inhalations per session if you find that side effects are occurring regularly.

For any side effect that concerns you, or that does not resolve quickly after stopping use, contact your pharmacist or GP. Do not continue using the product if you are experiencing persistent or worsening symptoms.

Can CLear O2 15L Interact With Other Medicines?

No clinically significant drug interactions are known for short-term, intermittent inhalation of supplemental oxygen at OTC concentrations in healthy adults. However, if you are being treated with bleomycin (a chemotherapy agent), high-concentration oxygen is known to increase the risk of pulmonary toxicity and you must not use this product without specialist medical advice. If you are taking any prescribed medicines for a respiratory or cardiovascular condition, always check with your pharmacist before using supplemental oxygen.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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