Why oxygen
Every breath shapes how you feel.
You take around 20,000 breaths a day and think about almost none of them. KUN is a way to make three of them deliberate. Here's what supplemental oxygen actually is, where the evidence is strong, and where we're careful not to overclaim.
What KUN is
- 95% pure recreational oxygen in a portable canister
- Around 200 inhalations per 5L can
- No caffeine, no sugar, no stimulants, no calories
- Nothing to swallow, nothing to metabolise
- Usable anywhere, any time of day
What KUN isn't
- Not a medical device
- Not medical or therapeutic oxygen
- Not a treatment for any condition
- Not a replacement for medical advice or care
- Not a stimulant — it doesn't work like caffeine
The clearest case
Thinner air is real, and measurable
The percentage of oxygen in air stays at roughly 21% everywhere on earth. What changes with altitude is pressure — fewer molecules in each breath. Blood oxygen saturation falls with it, and most people begin to notice it somewhere above 2,000 metres.
The 3pm question
Coffee doesn't leave when you do
Caffeine has a half-life of roughly five to six hours in most adults. An afternoon coffee is still measurably in your system at bedtime, which is why the fourth cup often costs you the night. A breath costs you nothing later.
The room, not you
Stuffy rooms are doing something
In a closed meeting room, exhaled CO₂ accumulates faster than most ventilation systems clear it. Published research on indoor air quality has measured meaningful declines in cognitive test scores as CO₂ concentration rises — particularly in strategic thinking and information usage. That mid-afternoon fog often has more to do with the room than your willpower.
~400
ppm CO₂ outdoors
1,000+
ppm in a full meeting room
2,500+
ppm poorly ventilated, hours in
21%
oxygen in normal air
The most effective fix for a stuffy room is ventilation — open a window. KUN is a portable ritual for when you can't.
Four moments
When people reach for it
Between sets
Training
Three breaths in the rest interval, before the set that decides the session. A physical cue that resets your attention rather than your chemistry.
3pm, fourth meeting
The desk
When the room is stuffy and the fifth coffee would cost you the night. Open a window if you can. If you can't, take three.
Thin air
Altitude & travel
The one case where the physiology is unambiguous. Above 2,000 metres there genuinely is less oxygen in every breath you take.
Winding down
The pause
Morning routine, post-session, or the ten minutes you take back for yourself. Slow breathing is the point; the can is the prompt.
How to use it
The 3-breath reset
- 01Flip the cap and bring the mask to your mouth and nose.
- 02Press and inhale slowly for three seconds. Hold for two.
- 03Exhale fully. Repeat three times. Then get back to it.
KUN is recreational oxygen intended for general wellbeing and lifestyle use. It is not a medical device, is not medical or therapeutic oxygen, and is not intended to diagnose, treat, cure or prevent any disease or condition. It is not a substitute for sleep, medical care or professional advice. If you have a respiratory or cardiac condition, are pregnant, or are experiencing shortness of breath, consult a qualified healthcare professional. Not for use by children without adult supervision.