Note 24
How do smelling salts work?
Ammonia gas hits the membranes in your nose and lungs. You inhale harder without deciding to. That window is the whole product.
Smelling salts work because ammonia is irritating. A short breath over the neck of the bottle hits receptors in the nose and lungs. You inhale harder without deciding to. Heart rate ticks up. The room gets a little sharper. Then the gas is gone and you are left with whatever you were going to do anyway.
The inhalation reflex
That reflex is the product. British Journal of Sports Medicine’s old note on smelling salts describes it as a sympathetic irritant effect — a way to counter a faint. BrainFacts.org says the same in plainer English: ammonia fumes irritate the membranes inside the nostrils, you breathe, and a faint can break.
On a platform the faint is not the point. The point is the first three seconds. Hockey uses that window between a sit and a shift. Powerlifters use it between the chalk and the bar. Wrestlers use it in a hallway that smells like tape. Nobody needs a two-hour arc. They need the next attempt to be the one they showed up for.
Where the ammonia comes from
Ammonium carbonate releases ammonia gas when it meets moisture. In a Bardown bottle, a splash of water is the switch. Splash, cap, shake, once. After that you only open it when you want the reflex. A pre-activated bottle has already started spending itself on a warehouse shelf. Heat and a loose cap finish the job. That is why a tired bottle “doesn’t work.” The mechanism is fine. The gas already left.
What they are made of is the chemistry. What they are is the larger story.
How long the effect lasts
Seconds. Sometimes the feeling hangs on for under a minute. There is no high in the caffeine or nicotine sense. If you sit there “taking more,” you are not extending a peak. You are irritating an airway that already got the message. What they do is a spike, not a curve.
Why “it made me stronger” is the wrong sentence
A 2022 paper in the European Journal of Sport Science had people use ammonia inhalants and then test alertness, strength, and reaction time. They felt more alert. The bar did not clearly get lighter. Chemical & Engineering News wrote it up in 2025 when the NFL conversation got loud: the salts change how the play feels more than what the play is.
That is still a reason to use them, if you are honest about it. A ritual that puts you on the attempt is a tool. A listing that promises a new PR from a sniff is a different product.
How to let the mechanism work
Hold the bottle a few inches off the nose. A gentle inhale is enough. Cap it. Do not bury your face in it. Do not use it after a head hit — the same reflex that wakes a faint can hide a concussion. The steps are here. The cautions are here.
Read the short version on The Hit, or skip the essay and get the bottle.
Questions people ask next
How does the ammonia get into the air?
Ammonium carbonate releases ammonia gas when it meets moisture. In a Bardown bottle, a splash of water is the switch. Pre-activated bottles have already started leaking.
How long does the high from smelling salts last?
There is no high in the caffeine or nicotine sense. The sharp alertness is usually gone in seconds to under a minute.
Do smelling salts increase strength?
A 2022 study in the European Journal of Sport Science found higher perceived alertness without a clear gain in strength or reaction time. The bottle changes how the attempt feels more than what the bar weighs.