Nutrition and Health

What Is The pH Of Raisins? Are They Acidic Or Alkaline?

Raisins are a popular dried fruit enjoyed around the world in cereals, baked goods, trail mixes, and as tasty snacks. But when it comes to their pH, are raisins acidic or alkaline? Let’s take a closer look at determining the pH of raisins and what that means for your health.

Are Raisins Acidic or Alkaline?

Raisins are considered acidic in nature. They have a pH value ranging from about 3.3 to 4.2, which falls within the acidic range on the pH scale. The acidity is primarily due to the presence of organic acids, such as tartaric acid and malic acid, which are found in grapes and remain in the raisins after the drying process.

Why Are Raisins Acidic?

Raisins are dried grapes, which means their acidity comes from their origin as a tart fruit. 

The drying process of creating raisins appears to make them slightly more acidic. The low water content concentrates the natural acids present in grapes, including malic acid, tartaric acid, and citric acid. These organic acids give raisins their tangy, tart flavor profile.

This acidity is imparted by the main organic acids found in grapes:

  • Tartaric acid – The predominant acid in grapes, providing a tart flavor.
  • Malic acid – Adds to the sour taste of grapes. Also found in apples.
  • Citric acid – Provides a citrusy zing. Present in small amounts in grapes.

The process of dehydrating grapes into raisins does not change the inherent acidity. If anything, removing water concentrates the acidic compounds, making raisins a bit more sour than the grapes they’re derived from.

Factors Affecting Raisin pH

Several factors can cause subtle differences in the pH of raisins:

  • Grape Variety – The grape variety affects raisin acidity. Thompson seedless grapes, often used for raisins, tend to be slightly more acidic than other common raisin grapes like sultanas.
  • Drying Process – How the grapes are dried also plays a role. Sun-dried raisins may have a lower pH than those dried with mechanical dehydrators.
  • Storage Time – Longer storage times allow more acid hydrolysis to occur from the fruit’s organic acids reacting with water, lowering pH over time.
  • Growing Conditions – Climate, soil conditions, and ripeness when picked can cause fluctuations in starting pH levels of the grapes.

So exact raisin pH can vary based on specific production factors. But overall, they consistently fall in the moderately acidic range.

Health Effects of Raisin Acidity

The acidic pH of raisins has some important health implications:

  • May promote dental erosion – Raisins can adhere to teeth and their acids may demineralize enamel over time. Sticky dried fruit is a risk for dental health.
  • Potential for acid reflux – The acidity of raisins may aggravate heartburn or GERD in susceptible individuals, especially when consumed in large amounts.
  • Urinary changes – There is limited evidence that raisin acidity could increase uric acid excretion and lower urine pH. More research is needed.
  • Bone health – Some concern that the high acid load from raisins could enhance bone resorption and calcium loss. However, raisins do contain beneficial nutrients like potassium and polyphenols that may counteract this.

Overall, raisins are safe for most people when consumed in moderation as part of a healthy diet. Those with reflux, poor dental health, or kidney issues may want to limit acidic dried fruit.

Tips for Balancing Raisin Acidity

If you want to keep enjoying raisins but counteract their acidity, here are some suggestions:

  • Consume raisins along with alkaline foods like fruits, veggies, or nuts to neutralize the acid.
  • Choose less acidic dried fruits like apricots, dates, prunes, and figs instead.
  • Opt for smaller serving sizes of raisins to limit acid intake.
  • Avoid snacking on raisins alone – combine them with oatmeal, salads or baked goods.
  • Drink water after eating raisins to dilute the acidity and flush it from the mouth.
  • Practice good dental hygiene after consuming sticky, acidic dried fruits.

With some care, raisins can still be incorporated into an alkaline diet. Focus on balancing their acid load with more alkaline choices.


Raisins are clearly acidic, with a pH ranging from 3.3 to 4.2. Their tartness comes from high amounts of tartaric and other organic acids originally present in grapes. These acids can potentially impact dental health, reflux, urine chemistry and bones. However, raisins offer many nutrients and antioxidants that may counter their acidity when eaten in moderation. Following a balanced diet with alkaline-promoting choices like fruits and veggies can allow you to enjoy raisins while optimizing your acid-alkaline ratio.

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