Sugar-Free Marshmallows: Fluffy and Low-Carb

Marshmallows feel like the one candy you simply cannot make without sugar. They are essentially whipped sugar syrup held together with gelatin, so taking the sugar out usually collapses the whole thing into a sad puddle. Allulose changes that. It is the rare sweetener that behaves enough like sucrose in a hot syrup to whip up tall, set soft, and stay pillowy for days, which makes a genuinely low-carb marshmallow possible at home. Below is a reliable recipe, the science of why allulose is the right tool, and how to keep the numbers honest if you are watching blood sugar.

Why Allulose Is the Right Sweetener Here

Most baking happily takes erythritol or monk fruit. Marshmallows do not. They depend on a hot, syrupy, supersaturated liquid that whips into a stable foam and then sets without crystallizing. Erythritol recrystallizes as it cools, so an erythritol marshmallow turns gritty and brittle, more like dried foam than candy. Allulose, by contrast, stays smooth, resists crystallizing, and gives the syrup the body it needs to trap air. That is why it is the structural backbone here rather than a flavor afterthought.

A quick word on what does not work. Jaggery, honey, maple syrup, coconut sugar, and date paste are all still sugar as far as your glucose is concerned, even when they are marketed as natural, so they defeat the purpose. Maltitol, a common ingredient in commercial sugar-free candy, has a real and meaningful glucose effect and is not glycemically inert. If you want a marshmallow that earns the sugar-free label, allulose is the cleaner path, with a touch of monk fruit or pure stevia to boost sweetness without adding bulk. For more on which sweeteners behave in different recipes, see our sugar-free baking sweetener guide.

The Recipe: Classic Allulose Marshmallows

This makes one 8-by-8-inch pan, which we cut into 16 squares. Allulose is slightly less sweet than sugar, so a small amount of monk fruit or stevia rounds it out.

Ingredients:

• 3 tablespoons unflavored powdered gelatin (about 27 g)
• 1 cup cold water, divided into two half-cup portions
• 1 and 1/4 cups allulose (about 250 g)
• 1/4 teaspoon monk fruit extract (or to taste)
• 1/4 teaspoon fine salt
• 2 teaspoons vanilla extract
• Powdered allulose or a little powdered erythritol, for dusting

Method:

1. Lightly grease the pan and dust it with powdered allulose. Line with parchment if you want easy lift-out.
2. In the bowl of a stand mixer, sprinkle the gelatin over a half cup of cold water. Let it bloom for 10 minutes while you make the syrup.
3. In a saucepan, combine the allulose, salt, and the remaining half cup of water. Heat over medium, stirring until dissolved, then bring to a gentle boil. Cook to about 240F (116C) on a candy thermometer. Allulose browns faster than sugar, so keep the heat moderate and do not walk away.
4. With the mixer on low, slowly pour the hot syrup down the side of the bowl into the bloomed gelatin. Once combined, raise the speed to high.
5. Whip for 8 to 12 minutes until the mixture is thick, glossy, white, and roughly tripled in volume. Add the monk fruit and vanilla in the last minute.
6. Working quickly, scrape into the prepared pan and smooth the top. Dust with more powdered allulose.
7. Let set uncovered at room temperature for at least 4 hours, ideally overnight. Cut with a greased knife and dust the cut sides.

Per serving (1 square, 16 per pan): ~14 kcal, 1 g net carbs, 3 g protein, 0 g fat. The protein comes almost entirely from the gelatin, and the allulose is treated as effectively net-zero. If you want the full reasoning behind subtracting these carbs, our piece on net carbs vs total carbs walks through it.

Variation: Chocolate-Swirl Marshmallows

For a richer version, sift 2 tablespoons of unsweetened cocoa powder into the whipped marshmallow during the last 30 seconds of mixing, folding just enough to leave streaks. The cocoa adds a little fiber and fat but barely moves the sugar.

Ingredients (additions to the base recipe):

• 2 tablespoons unsweetened cocoa powder
• An extra pinch of monk fruit to balance the cocoa’s bitterness

Per serving (1 square, 16 per pan): ~18 kcal, 1 g net carbs, 3 g protein, 1 g fat. Because cocoa contributes fiber, the net-carb figure stays low even though total carbohydrate ticks up slightly.

A Note on Texture and Timing

Allulose marshmallows are a touch softer than the supermarket kind and they brown faster, which matters if you plan to toast them. Pull them from any heat sooner than you think. They also do not love humidity, so keep them in an airtight container with a generous coat of powdered sweetener. If your kitchen is very humid, they may stay slightly tacky, which is normal for a no-sugar recipe and does not mean they failed. Scaling the recipe up or down is straightforward, and our note on recipe scaling and calorie scaling covers keeping the macros accurate when you change the batch size.

How to Log This in CalEye

You have two good options. For a quick estimate, snap a photo of your marshmallows and let CalEye’s photo logging estimate the calories and macros from the image. That is the easiest path when you are eating one or two and do not want to fuss.

For a recipe you will make again, the more accurate approach is to build it once in My Recipes. Weigh each ingredient as you add it, set the yield to 16 servings, and CalEye stores the per-serving breakdown so you can log a single marshmallow with one tap every time after that. This is where the sweetener handling matters: CalEye applies net-carb logic to sugar alcohols, subtracting erythritol fully and counting xylitol and maltitol at about half. Allulose, while technically a rare sugar rather than a sugar alcohol, is treated as effectively net-zero for the same practical reason: it contributes almost nothing usable to your glucose. The result is a logged carb count that reflects what your body actually processes rather than what the package weight suggests.

If sweeteners and sugar alcohols still feel like a gray area, our explainer on the sugar alcohols carb-counting gray zone lays out exactly how each one behaves.

References

1. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central. Washington, DC: USDA, 2024.
2. American Diabetes Association. “Get to Know Carbs: Sugar Substitutes and Sugar Alcohols.” Diabetes Food Hub and Standards of Care, 2024.
3. Han Y, Kwon EY, Yu MK, et al. “A Preliminary Study for Evaluating the Dose-Dependent Effect of D-Allulose for Fat Mass Reduction in Adult Humans.” Nutrients, 2018; 10(2):160.