Decaf green tea is mildly acidic, with a pH that typically falls between 7 and 8 when brewed, making it close to neutral and gentler than coffee, juice, or soda. If you’re wondering whether switching to decaf green tea will help with acid reflux or stomach sensitivity, the short answer is that it’s one of the least acidic beverages you can choose.
How Acidic Is Green Tea on the pH Scale?
Brewed green tea generally lands in the range of 7 to 10 on the pH scale, depending on the variety, brewing time, and water temperature. For reference, pure water sits at 7.0 (neutral), coffee falls around 4.5 to 5.0, and orange juice is roughly 3.5. Green tea is far closer to water than to any of those drinks, which is why it’s often described as “mildly acidic” or even slightly alkaline rather than truly acidic.
The mild acidity comes from a mix of organic acids naturally present in tea leaves. The dominant ones are citric acid (up to 44.8 mg per gram in matcha-grade tea), malic acid (up to 32.2 mg/g), oxalic acid (up to 4.46 mg/g), and succinic acid (up to 4.44 mg/g). These are the same organic acids found in fruits and vegetables, and in green tea they appear in relatively small concentrations compared to drinks like citrus juice.
Does Decaffeination Change the Acidity?
Decaffeination actually reduces the overall organic acid content in green tea. The most common commercial method uses supercritical CO2 to strip caffeine from the leaves, and this process removes roughly 32.6% of the organic acids along with it. Specifically, it lowers levels of malic acid, citric acid, and succinic acid. So decaf green tea is, if anything, slightly less acidic than regular green tea.
The trade-off is that decaffeination also strips out other compounds. It removes about 87% of the plant compounds responsible for green tea’s characteristic flavor and health associations, and nearly all of the compound that gives tea its savory, umami quality. The result is a noticeably milder, less astringent cup. Some people find decaf green tea tastes flatter or less complex, which is partly because those flavor-active acids and plant compounds have been reduced.
Decaf Green Tea and Acid Reflux
If you’re managing reflux symptoms, green tea (regular or decaf) is a much safer bet than coffee. A study measuring esophageal acid exposure in healthy volunteers found that regular tea did not increase reflux compared to plain water. Decaffeinating the tea made no additional difference, because the tea wasn’t causing reflux in the first place. Coffee, by contrast, significantly increased reflux, and that effect persisted even after decaffeination, though to a lesser degree.
This tells you something important: the reflux-triggering compounds in coffee aren’t caffeine itself but other substances unique to coffee beans. Tea simply doesn’t contain those irritants. So if you’re switching from coffee to decaf green tea specifically to reduce reflux, you’re likely making a helpful change, but the benefit comes more from dropping coffee than from choosing decaf over regular tea.
That said, some people with sensitive stomachs find that any caffeine relaxes the valve between the esophagus and stomach, making reflux slightly more likely. If that’s your experience, decaf green tea gives you the mildest possible version of the drink: lower caffeine, fewer organic acids, and less astringency.
What Makes Green Tea Gentler Than Other Drinks
To put green tea’s acidity in perspective, here’s how common beverages compare on the pH scale:
- Lemon juice: pH 2.0
- Orange juice: pH 3.5
- Soda: pH 2.5 to 3.5
- Coffee: pH 4.5 to 5.0
- Black tea: pH 4.9 to 5.5
- Green tea: pH 7 to 10
- Water: pH 7.0
Green tea sits in a completely different category from most beverages people worry about. Black tea is more acidic than green tea because the fermentation process that turns green leaves into black tea increases organic acid content. If you’re choosing between tea types for stomach comfort, green tea is the gentler option, and decaf green tea is gentler still.
Brewing Tips to Keep Acidity Low
How you prepare your tea affects its final acidity. Steeping for longer extracts more organic acids and tannins, so keeping your brew time to two or three minutes rather than five will produce a less acidic cup. Using water just below boiling (around 160 to 175°F) also limits acid extraction compared to using fully boiling water.
Adding a small amount of milk or a non-dairy alternative can buffer whatever mild acidity is present, though most people won’t need to bother. If you’re drinking decaf green tea and still noticing stomach discomfort, the issue is more likely related to drinking on an empty stomach or to tannins (which cause that dry, astringent feeling) rather than to acid content itself. Having a small snack alongside your tea can help.