The pH of Coffee — What It Means and Why It Matters for Your Health

The pH of Coffee — What It Means and Why It Matters for Your Health

pH is the single most important number in your coffee that nobody talks about. Not the origin. Not the roast level. Not the price per bag. The pH determines how your coffee interacts with your body — your gut, your teeth, your cortisol response, your gut flora. And most coffee drinkers have never once looked at the number.

The pH Scale — What the Numbers Mean

The pH scale is logarithmic:

• pH 4.8 (regular coffee) is 10× more acidic than pH 5.8 (Puroast)
• pH 4.8 is 100× more acidic than pH 6.8 (close to neutral)
• The difference between pH 5.0 and pH 5.5 is a 3× difference in acidity

The Official pH Registry — Every Major Coffee Brand Tested

The Low Acid Coffee Consumer Standard Association (LACCSA) published the first official peer-reviewed pH registry of coffee brands in March 2024. Results:

Why pH 5.5 Is the Critical Threshold

pH 5.5 is not an arbitrary number. It is the critical demineralization threshold established in peer-reviewed dental and gastroenterological research:

• Dental enamel begins to demineralize at pH 5.5. Every cup of coffee below this threshold is eroding your enamel.
• Gastric irritation is meaningfully reduced above pH 5.5. The stomach lining experiences significantly less acid response.
• Gut flora disruption decreases above pH 5.5. Beneficial bacteria are better preserved in a more alkaline environment.

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