Soursop is an acidic fruit, not an alkaline one. Fresh soursop pulp has a pH between 3.6 and 4.6, placing it firmly in the acidic range alongside oranges and pineapples. However, some people asking this question are really wondering about soursop’s effect on the body after digestion, which is a different matter entirely. Here’s what the science actually shows.
Soursop’s Measured pH
The pH scale runs from 0 (most acidic) to 14 (most alkaline), with 7 being neutral. Soursop pulp consistently measures between 3.6 and 4.6, depending on ripeness. Harder, less ripe fruit sits closer to 3.6, while fully ripe, soft soursop climbs toward 4.6. Either way, it’s clearly acidic.
That acidity comes from citric and malic acids, the same organic acids found in citrus fruits and green apples. As soursop ripens, malic acid increases roughly sevenfold and citric acid triples, which might seem like the fruit gets more sour. But sugar content also rises dramatically during ripening, masking the acidity with sweetness. The combination of sugars and organic acids is what gives soursop its distinctive sweet-tart flavor.
Soursop Leaf Tea Is Nearly Neutral
If you drink soursop as a leaf tea rather than eating the fruit, the pH picture changes significantly. Brewed soursop leaf tea has a pH of about 6.4, which is close to neutral and far less acidic than the fruit itself. Adding dried soursop pulp to the tea drops the pH to around 5.0, since you’re reintroducing those fruit acids.
So if you’re looking for the least acidic way to consume soursop, plain leaf tea is the clear winner. It’s roughly on par with regular drinking water in terms of acidity.
The “Alkaline Diet” Claim
Many websites label soursop as “alkaline-forming,” meaning that even though the fruit itself is acidic, it supposedly leaves an alkaline residue in your body after digestion. This idea comes from the alkaline diet theory, which categorizes foods not by their actual pH but by the mineral “ash” they’d leave behind if burned.
Soursop does contain minerals that alkaline diet proponents consider alkalizing. One analysis found soursop fruit contains about 726 mg of potassium per 100 grams, which is substantially more than a banana. Potassium, along with magnesium and calcium, are the minerals typically cited as producing alkaline byproducts during metabolism.
The problem is that this framework oversimplifies how the body works. Your blood pH is tightly regulated between 7.35 and 7.45 regardless of what you eat. Your kidneys and lungs maintain this balance constantly. Eating soursop won’t meaningfully shift your body’s pH in either direction. What soursop can do is contribute useful minerals to your diet, but calling it “alkaline” based on those minerals is misleading.
What Soursop Actually Contains
Rather than focusing on alkalinity, here’s what’s nutritionally relevant. A 100-gram serving of soursop pulp contains about 16.8 grams of carbohydrates, with 13.5 grams of that being sugar. The fruit is 80 to 85 percent water. It provides 3.3 grams of dietary fiber and about 1 gram of protein per serving. The sugar is predominantly fructose and glucose, with some sucrose.
The fruit’s high potassium content is genuinely notable. At over 700 mg per 100 grams, soursop is one of the more potassium-rich tropical fruits available. Potassium supports healthy blood pressure and muscle function, making soursop a reasonable dietary source of this mineral regardless of any alkaline claims.
A Safety Note on Heavy Consumption
Soursop contains a compound called annonacin that deserves attention if you’re planning to eat large amounts regularly. A single average soursop fruit contains roughly 15 mg of annonacin, and a can of commercial soursop nectar contains about 36 mg. In rat studies, annonacin caused damage to brain regions involved in movement when administered intravenously over time.
A study of 160 patients with Parkinson’s-like symptoms in Guadeloupe, where soursop consumption is common, found unusual patterns of neurological disease. About one-third had a type of movement disorder rarely seen elsewhere. The French food safety agency reviewed this evidence and, while not concluding that soursop definitively caused these conditions, called for further investigation into potential risks.
Occasional consumption is unlikely to pose problems, but daily heavy intake of soursop fruit or concentrated nectar over months or years warrants caution. Soursop leaf tea contains far less annonacin, roughly 140 micrograms per cup, which is a tiny fraction of what’s found in the fruit itself.