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High-Polyphenol Coffee Backed by Science: The Research Behind Stiir



Stiir was built to prove what coffee can do when precision meets evidence. Working with leading university scientists, every batch has been tested for caffeine and total polyphenol content to guarantee consistency and measurable benefit.




Coffee and Caffeine: A Performance Catalyst


Caffeine, a key compound in coffee, has been widely researched for its effects on both physical and cognitive performance. It supports focus, reaction time, endurance and power output across a wide range of activities.


Athletes have long used caffeine in many forms — gels, drinks, tablets and gum — but coffee remains the most natural source. Research shows that coffee itself can deliver comparable performance benefits to isolated caffeine, while also providing additional health-supportive compounds.


Many prefer coffee over synthetic supplements for its balanced release and broader nutritional profile.



Caffeine for Endurance, Strength and Power


Systematic reviews consistently show that caffeine enhances endurance performance, strength and explosive power. These studies demonstrate moderate but reliable improvements across sports such as running, cycling and resistance training. Caffeine also supports cognitive function during prolonged exertion, improving decision-making and mental focus.


Each serving of Stiir provides a precise **185 mg of natural caffeine** (+/- 10 mg), delivering clean, predictable energy without overstimulation.


Polyphenols for Health and Recovery


Polyphenols are plant-based compounds known for their antioxidant and anti-inflammatory properties. Coffee is one of the richest dietary sources, with around 30 percent of its polyphenols absorbed into the bloodstream — a higher rate than most foods.


The dominant polyphenol in coffee, **chlorogenic acid**, is linked to wide-ranging benefits: antioxidant, anti-diabetic, anti-inflammatory and recovery-supportive effects. Research also indicates that polyphenols can aid post-exercise muscle glycogen resynthesis and overall metabolic health.


Each serving of Stiir contains **270 mg of total polyphenols** (+/- 10 mg), verified through independent lab testing.


Coffee and Long-Term Health


Beyond performance, regular coffee consumption has been associated with improved long-term health outcomes.


Cardiovascular Health

Habitual consumption of three to five cups per day is linked to a roughly 15 percent reduction in cardiovascular disease risk.


Type 2 Diabetes

Studies show that regular coffee intake correlates with a lower risk of Type 2 diabetes in both men and women, likely through antioxidant, thermogenic and microbiome effects.


Longevity

Large-scale cohort studies indicate that coffee drinkers show reduced all-cause and cause-specific mortality, with overall health benefits outweighing potential risks.


Stiir’s Competitive Edge


Precision

Every batch of Stiir is tested for consistency. Three separate brews were analysed under controlled conditions (18 g ground coffee, five-minute brew at 90 °C, 250 ml yield). Mean values: **185 mg caffeine** and **271 mg polyphenols** per serving.


Natural Integrity

Stiir remains a natural food product, never a synthetic supplement. It combines high-grade flavour with measurable function.


Scientific Credibility

Formulation and verification were led by PhD-level nutrition scientists and tested in partnership with Sheffield Hallam University. Stiir’s claims are backed by peer-reviewed research and real-world data, not marketing language.


Our Commitment to Transparency


We rely on peer-reviewed meta-analyses and systematic reviews to guide formulation decisions. While most studies highlight positive outcomes from coffee, caffeine and polyphenols, individual responses vary. Our role is to make those findings accessible, consistent and reliable, so you know exactly what’s in your cup and why it matters.



References and Further Reading


The following studies and reviews support the research summarised in this article. They provide detailed evidence on caffeine, polyphenols, and the broader health effects of coffee.


 
 
 

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