Dunkin' is America's coffee. Billions of cups served. Accessible, affordable, consistent — it is the working coffee of this country. And for most of its history, nobody asked what the pH of a Dunkin' dark roast actually was. Because nobody thought to ask.
That is changing. As acid reflux becomes one of the most common chronic conditions in America — affecting 68 million people — more coffee drinkers are asking the question that should have been on the label all along.
~5.0
Dunkin' Dark Roast pH
5.82
Puroast pH — UC Davis Confirmed
68M
Americans with Acid Reflux Daily
DUNKIN' DARK ROAST — WHAT THE DATA SHOWS
Dunkin's dark roast is a 100% Arabica blend, roasted to a dark profile for a bold, full-bodied cup. By mainstream standards, it is excellent value. The flavor is rich, the price is accessible, and the consistency across millions of locations is a genuine logistical achievement.
But Dunkin' dark roast is roasted using the same industrial drum roasting process as every other major commercial brand. Research from Shibamoto et al. (2009) confirmed that standard commercial roasting — regardless of roast level — does not meaningfully reduce quinic acid concentration. Dunkin' dark roast has a pH of approximately 5.0.
For the 68 million Americans with acid reflux, that number matters. A pH of 5.0 means highly acidic coffee — coffee that irritates the esophageal lining and triggers reflux symptoms in sensitive individuals. Dunkin' dark roast is no exception.
⚠️ The Volume Problem: Most Americans drink 2–3 cups of coffee per day. At pH 5.0, that is a significant daily acid load on your esophagus, stomach, and gut lining. Over months and years, this contributes to chronic inflammation, GERD, and digestive discomfort that many people simply accept as normal. It is not normal. It is the coffee.
DUNKIN' VS PUROAST — THE FULL COMPARISON
| Factor |
Dunkin' Dark Roast |
Puroast Dark French Roast |
| pH Level |
~5.0 |
5.82 ✅ |
| Antioxidant Level |
Standard |
5X Higher ✅ |
| Roasting Process |
Industrial Flash Roast |
Patented Slow Roast ✅ |
| Good for Acid Reflux |
❌ |
✅ |
| UC Davis Verified |
❌ |
✅ |
Dark French Roast 2.5lb
5X Less Acid Than Dunkin'
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French Roast Pods 24ct
Low Acid. Single Serve.
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Italian Espresso Roast 2.5lb
Bold. Dark. Low Acid.
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✅ The Low Acid Standard: Puroast's pH of 5.82 is confirmed by UC Davis and peer-reviewed in three published papers. The roasting process is USPTO patented — no other brand can legally replicate it. When you switch from Dunkin' dark roast to Puroast, you are not just switching brands. You are switching chemistry.
FREQUENTLY ASKED QUESTIONS
Is Dunkin' dark roast low acid?
No. Dunkin' dark roast has a pH of approximately 5.0, consistent with standard commercial dark roasts. It is not low acid coffee. Puroast is the only commercially available dark roast confirmed at 5X less acidity through peer-reviewed science.
Why does Dunkin' coffee upset my stomach?
The quinic acids in standard commercial coffee — including Dunkin' — irritate the esophageal lining and trigger acid reflux and stomach discomfort. This is not a sensitivity to caffeine. It is a reaction to the acidity of the coffee itself. Switching to a genuinely low acid coffee like Puroast addresses the root cause.
What is the pH of Dunkin' coffee?
Dunkin' coffee has a pH of approximately 5.0 across its roast levels. By comparison, Puroast has a confirmed pH of 5.82 — 5X less acidic on the logarithmic pH scale.
Is Dunkin' dark roast stronger than medium roast?
No — darker roasting actually burns off caffeine, so dark roast coffee typically has slightly less caffeine per ounce than medium roast. The perception of strength comes from the bolder, more bitter flavor profile — which is a product of the roasting process, not caffeine content.
You Deserve Better Than Dunkin' Dark Roast.
Puroast delivers bold dark roast flavor at 5X less acid — confirmed by UC Davis, patented by the USPTO, and loved by the 68 million Americans who thought they had to give up coffee.
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Sources: Shibamoto et al. (2009). DOI: 10.1021/jf9001687 · American College of Gastroenterology. gi.org · NC A&T Low Acid Coffee Study (2013).
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Consult your physician regarding acid reflux or gastrointestinal conditions.
