It can seem odd to find a calming amino acid in a breathing spray. But anyone who has felt their chest tighten before a big meeting knows stress and breathing are connected. That is the thinking behind L-theanine in BreathiZen.
L-theanine is an amino acid found naturally in tea leaves and associated with calm, relaxed focus. BreathiZen includes it because stress tends to make breathing faster and shallower. A simple habit to pair with it: breathe out for longer than you breathe in.
What L-theanine is — and why BreathiZen uses it
L-theanine occurs naturally in green and black tea. It is widely used in supplements for its association with calm, relaxed focus without drowsiness.
How tension changes breathing — the BreathiZen view
When you are stressed, breathing often becomes quicker and shallower and moves up into the chest. A calmer nervous system tends to breathe more slowly and deeply. L-theanine is BreathiZen's nod to that side of the equation.

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Buy nowA longer-exhale habit to pair with BreathiZen
Sit comfortably. Breathe in through your nose for four counts, then out slowly through your mouth for six. Repeat for two or three minutes. A longer exhale is one of the simplest ways to help yourself settle.
One round of longer-exhale breathing
L-theanine and BreathiZen: good to know
L-theanine is generally well tolerated. If you take blood pressure medicine or sedatives, check with your doctor before adding any calming supplement.
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BreathiZen questions
Will L-theanine make me sleepy?
It is usually associated with relaxed focus rather than drowsiness.
Is L-theanine the same as caffeine?
No. Both occur in tea, but L-theanine is not a stimulant.
BreathiZen sources & further reading
These statements have not been evaluated by the Food and Drug Administration. BreathiZen is a dietary supplement, not intended to diagnose, treat, cure or prevent any disease, and never a substitute for an inhaler or prescribed treatment. Linked organisations do not endorse BreathiZen. This site carries affiliate links.