Clarity in every cup
Created with scientific precision and verified in the lab, Stiir is coffee built on evidence and experience.
Shaped by PhD-level nutrition experts and informed by real professional athletes at the highest level.
Built on Measurable Results
Working with laboratory professors, our coffee was brewed and analysed multiple times under controlled conditions using a standardised, validated chemical assay. Each test used 18g of ground coffee brewed at 90°C for five minutes, producing 250ml per serve.
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The results were consistent across every batch. Each cup averaged 185mg of natural caffeine and 270mg of polyphenols, measured to within ten milligrams. That level of precision matters. Most coffees vary depending on bean origin, roast, and preparation. Stiir is built to remove that uncertainty, delivering steady, predictable energy every time.
The Power of Caffeine and Polyphenols
Caffeine is one of the most studied natural performance compounds in the world. The right dose sharpens focus, improves reaction time and sustains physical and mental performance without overstimulation.
Polyphenols are the quiet strength in our coffee, natural compounds that protect cells and support recovery through antioxidant and anti-inflammatory effects. The dominant polyphenol in Stiir, chlorogenic acid, has been linked to benefits for cardiovascular health, blood sugar control and muscle recovery.
By optimising bean selection and roast profile, we preserve a higher level of these compounds than standard coffees. The result is a cup that does more than keep you awake, it helps you function better.
Science Meets Real Life
​We believe science is most valuable when it leads to real improvements in health. Every element of Stiir was refined with input from professional athletes, sports scientists and PhD-level nutrition experts who understand performance under pressure. It’s coffee built for real life, whether that means early starts, long workdays or training sessions that demand focus and recovery.
The goal was simple: create a coffee that delivers clarity, balance and consistency without compromise. No spikes. No crash. Just clean energy that aligns with how your body naturally performs.
Proof, Not Promises
Our standards are rooted in evidence. Every claim about Stiir is supported by independent research and verified testing. While each person’s response to caffeine and polyphenols will differ, the formulation doesn’t change.
What’s in the cup stays the same, every time.
To explore the research that shaped Stiir, read our full study summary
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High-Polyphenol Coffee Backed by Science: The Research Behind Stiir
Our Commitment to Transparency
We base every claim on credible, peer-reviewed research, including meta-analyses and systematic reviews. It’s part of our commitment to scientific integrity and honesty. The studies we reference represent only a small portion of the wider evidence on coffee, caffeine, and polyphenols in health and performance.
Most research points to clear benefits, but responses vary from person to person. Some feel an immediate difference, others notice it over time. What matters is understanding the science and finding what works for you.