Unsweetened almond milk is slightly acidic to nearly neutral, with a pH around 6.5. That puts it close to water (pH 7) on the acidity scale and makes it one of the least acidic beverages you can choose. Sweetened versions are a different story, dropping as low as pH 4.6, which is closer to orange juice territory.
The pH of Almond Milk
On the pH scale, anything below 7 is acidic and anything above 7 is alkaline. Unsweetened almond milk sits at roughly 6.48, making it only very mildly acidic. For context, cow’s milk typically falls between 6.5 and 6.7, so the two are quite close when sugar isn’t involved.
The picture changes dramatically with sweetened varieties. In lab testing, sucrose-sweetened almond milk measured around 4.56, nearly two full pH points lower than unsweetened versions. That gap matters because the pH scale is logarithmic: each whole number represents a tenfold difference in acidity. A sweetened almond milk at pH 4.5 is roughly 100 times more acidic than an unsweetened one at pH 6.5.
Why Sweetened and Unsweetened Differ So Much
The sugar itself doesn’t make the liquid acidic the moment you pour it. The difference shows up when bacteria interact with that sugar, whether in your mouth or in a lab culture. Sweetened almond milks that contain cane sugar (sometimes labeled “evaporated cane juice”) can have more than seven grams of sugar per serving. Oral bacteria feed on that sugar and produce acid as a byproduct, which drives the pH down rapidly.
Unsweetened almond milks stayed above pH 5.5 even after 24 hours of bacterial exposure in lab studies. That threshold matters for dental health because tooth enamel begins to break down below pH 5.5. Sweetened versions fell well below it, behaving more like sugary soft drinks in terms of their effect on enamel.
What Almond Milk Does Inside Your Body
The pH of a food in the glass doesn’t tell you whether it makes your body more acidic or more alkaline after digestion. Nutritional researchers use a measurement called PRAL (potential renal acid load) to estimate this. A negative PRAL score means a food has an alkaline effect once metabolized; a positive score means it’s acid-forming.
Almond milk has a mean PRAL score of -0.50 mEq/100 ml, meaning it’s mildly alkaline-forming in the body. Individual products range from -3.57 (notably alkaline) to +0.85 (very mildly acid-forming), depending on the brand and what’s been added. On the whole, though, almond milk leans slightly alkaline after digestion.
How It Compares to Other Plant Milks
Soy, oat, and almond milk all land in a similar range when it comes to their metabolic effect. Soy milk has an average PRAL of -1.11, oat milk comes in at -0.79, and almond milk at -0.50. All three are mildly alkaline-forming, and the differences between them are not statistically significant. If you’re choosing a plant milk based on acidity alone, any of these are roughly equivalent.
Additives That Shift the pH
Commercial almond milks contain ingredients specifically designed to adjust acidity. Tricalcium phosphate, potassium citrate, and sodium bicarbonate (baking soda) all serve as alkalizing or buffering agents. They help stabilize the product, prevent separation, and keep the pH from drifting too far in either direction during shelf life. This is one reason why store-bought almond milk tends to be more consistent in its pH than a batch you’d make at home by blending almonds with water.
Homemade almond milk, which typically contains nothing but almonds and water, will vary depending on the ratio and the almonds themselves. Without added buffering agents, it generally sits in the mildly acidic to neutral range but can be less predictable from batch to batch.
Almond Milk and Acid Reflux
People with acid reflux often look for beverages that won’t trigger symptoms. Full-fat cow’s milk can worsen reflux because the fat relaxes the valve between the esophagus and stomach, allowing acid to creep upward. Almond milk, especially unsweetened varieties, is frequently recommended as a substitute. Its near-neutral pH means it won’t add acidity to an already irritated esophagus, and its low fat content avoids the fat-related trigger.
If you’re using almond milk to manage reflux symptoms, the unsweetened version is the better choice. Sweetened almond milk’s lower pH and added sugars can work against you, particularly if you’re sipping it throughout the day. Flavored varieties (vanilla, chocolate) often contain both added sugar and additional acidic ingredients, so checking the label matters more than the “almond milk” label on the front.
The Bottom Line on Acidity
Unsweetened almond milk is barely acidic in the glass and mildly alkaline in its effect on your body. It’s comparable to cow’s milk and other plant milks in both respects. Sweetened versions are significantly more acidic, especially once bacteria get involved, which has real implications for tooth enamel and reflux. Choosing unsweetened keeps almond milk squarely in the low-acidity category.