Keto Simple Syrup

Keto Sugar-Free Simple Syrup for Drinks
The Spruce / S&C Design Studios
Prep: 5 mins
Cook: 10 mins
Cool: 30 mins
Total: 45 mins
Servings: 10 servings
Yield: 1 1/4 cups
Nutrition Facts (per serving)
8 Calories
0g Fat
2g Carbs
0g Protein
Show Full Nutrition Label Hide Full Nutrition Label
Nutrition Facts
Servings: 10
Amount per serving
Calories 8
% Daily Value*
Total Fat 0g 0%
Saturated Fat 0g 0%
Cholesterol 0mg 0%
Sodium 1mg 0%
Total Carbohydrate 2g 1%
Dietary Fiber 0g 0%
Total Sugars 2g
Protein 0g
Vitamin C 0mg 0%
Calcium 1mg 0%
Iron 0mg 0%
Potassium 0mg 0%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)

Whether it's lemonade or your favorite cocktails, many beverages rely on a sweetener like simple syrup. This can become a challenge when you're reducing or eliminating sugar to follow a keto diet. However, there's no need to skip the homemade drinks because it's easy to make a sugar-free simple syrup.

Several sweeteners are designed to replace sugar, but not every one of those works well in simple syrup. Some, such as stevia, have a bitter taste that can throw off a drink's balance of flavors. Erythritol and xylitol sweeteners (including those with monk fruit) do not dissolve well; they seem to work in a hot syrup but will crystalize once cooled. The solution to both of these issues is to use an allulose monk fruit sweetener.

Produced by a few companies, the allulose sweetener dissolves very well in hot and cold water. More importantly, the taste of monk fruit mimics the sweetness of regular sugar without a bitter aftertaste. When making a syrup, you simply have to use this sweetener as an equal-measure substitute for sugar in a standard simple syrup recipe.

There are many exciting possibilities for this zero-calorie simple syrup. For instance, you can add flavor and, in some cases, even use it to replace the sugary liqueurs often used in cocktails. It keeps well, so you can make a large batch and have it on hand whenever you want to make a sugar-free drink.


  • 1 cup water

  • 1 cup granulated allulose monk fruit sweetener

Steps to Make It

  1. Gather the ingredients.

    Ingredients for Keto Sugar-Free Simple Syrup for Drinks
    The Spruce / S&C Design Studios
  2. In a small saucepan, bring the water to a boil.

    Water boiling in a pot for Sugar-Free Simple Syrup
    The Spruce / S&C Design Studios
  3. Reduce the heat to a simmer and whisk in the sweetener until completely dissolved. Simmer for 5 minutes.

    Sugar-Free Simple Syrup in a pot with a whisk
    The Spruce / S&C Design Studios
  4. Remove from the heat and let cool completely before transferring to a bottle with a tight sealing lid. Keep refrigerated and use within 2 weeks.

    Keto Sugar-Free Simple Syrup for Drinks
    The Spruce / S&C Design Studios
  5. Use in your favorite drinks and enjoy.

    Keto Sugar-Free Simple Syrup for Drinks
    The Spruce / S&C Design Studios

How to Use Keto Simple Syrup

Generally, this simple syrup can replace sugar syrup measure-for-measure in any drink recipe. As with any syrup, you might want to add a little more or less to drinks to adjust the sweetness to your taste. Use it as the base for homemade sodas, the sweetener for lemonade, or in any drink that calls for simple syrup, agave nectar, honey, or other liquid sweeteners.

Recipe Variations

  • Infuse the syrup with herbs, spices, or other botanicals. Add the flavoring ingredients while the syrup simmers and strain it out once cool (or before if it reaches your desired flavor). Cinnamon, lavender, mint, and vanilla are excellent options.
  • For a quick flavor boost, add about 1/4 teaspoon of a flavoring extract to the cooled syrup, and adjust to taste.
  • Use this syrup as a base for a homemade sour mix by adding lemon and/or lime juices.
  • Create a sugar-free triple sec substitute by adding a tablespoon of orange juice and orange peels before simmering. Use this for margaritas, cosmopolitans, and any other cocktail that calls for orange liqueur.
  • Similarly, play with fruits, such as cherry, pomegranate, and raspberry, to replace flavored liqueurs and syrups. Use fresh fruits or fruit juice, but keep in mind that fruits have their own sugars; you just won't be adding any with the syrup base.