You're ready to test. But there's one critical step between you and accurate results: the 30-minute preparation window.
This isn't optional—it's what makes your cortisol data reliable, whether testing baseline or lifestyle factors.
Why 30 minutes matters
The window serves two purposes:
1. Clean saliva sample
Food, caffeine, toothpaste—all create chemical interference. The window clears your mouth so the test measures cortisol accurately, not contamination.
2. Cortisol response time
When something triggers cortisol (stress, exercise, caffeine), it takes 15-20 minutes to peak. The window ensures you capture the full response, not mid-rise.
Studies show oral contamination creates 15-30% measurement error—enough to completely mask what's happening.
The protocol
In the 30 minutes before testing, avoid:
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Food and drinks (except plain water)
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Brushing teeth or mouthwash
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Smoking, vaping, gum, mints
Plain water is fine. Light activity like walking won't affect results.
Important: Avoid biotin supplements for 24 hours before testing.
Testing lifestyle factors
The window applies to every test—baseline and lifestyle testing.
Testing coffee? Drink coffee → wait 30 min → test. This clears coffee residue AND captures peak caffeine response.
Post-workout? Finish exercise → wait 20-30 min → test. Captures peak cortisol response with clean saliva.
After stress? Meeting ends → wait 20-30 min → test. Cortisol peaks 15-20 minutes after stressors.
Post-meal? Finish eating → wait 30 min → test. Clears food particles and reveals if the meal spiked cortisol.
Make it automatic
Morning baseline: Wake → test (before coffee/food)
Post-coffee: Coffee → wait 30 min → test
Post-workout: Exercise → wait 20-30 min → test
Evening baseline: Last food/drink → wait 30 min → test
Set the in-app reminders. The ritual becomes automatic, your data becomes trustworthy.
Every test, every time—30 minutes for clean data and complete responses.
