What Is Allulose? The Complete Guide to the Rare Sugar.
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What Is Allulose? The Complete Guide to the Rare Sugar
If you have been searching for a sugar substitute that actually tastes like sugar, bakes like sugar, and does not send your blood glucose into a tailspin, you have probably hit a wall. Stevia tastes bitter to most people. Erythritol causes a cooling sensation and can cause digestive distress in large amounts. Monk fruit is expensive and almost always blended with erythritol anyway. Sucralose is artificial. None of them are sugar.
Allulose is different. It is a real sugar molecule, one that occurs naturally in nature, and its unusual chemistry is the reason it has become the most talked-about sweetener in keto and diabetic-friendly food circles in recent years. This guide covers what allulose is, where it comes from, how it behaves in your kitchen, and why it has earned a category of its own.
What Is Allulose, Exactly?
Allulose (also called D-psicose) is a monosaccharide, a simple sugar, just like glucose and fructose. Structurally, it is a C-3 epimer of fructose, which means it shares fructose's molecular structure with one small positional difference in its atoms. That tiny difference is enough to change everything about how your body processes it.
When you eat allulose, your small intestine absorbs it but your body cannot convert it to usable energy. Instead, it is excreted in urine, largely unmetabolized. The measured caloric value is roughly 0.2 to 0.4 kcal per gram, compared to 4 kcal per gram for regular sugar. The glycemic impact? Essentially zero. Clinical studies show it does not raise blood glucose or insulin in healthy adults.
The FDA recognized allulose as Generally Recognized as Safe (GRAS) and issued guidance in 2019 allowing manufacturers to exclude it from the "Total Sugars" and "Added Sugars" lines on Nutrition Facts panels, because it is not metabolized the way other sugars are. That makes it one of the only sweeteners where the "sugar" on the label is essentially invisible.
Where Does Allulose Come From?
Allulose occurs naturally in small amounts in a handful of foods: figs, raisins, jackfruit, kiwis, and certain wheat products. The concentration in these foods is very low, which is why you have probably never heard of it until recently. It was not commercially viable to extract from fruit in meaningful quantities.
Commercial allulose is produced via an enzymatic conversion process, typically using fructose derived from non-GMO corn or sometimes tapioca as the starting material. An enzyme called D-psicose 3-epimerase converts the fructose into allulose. The result is a high-purity liquid or crystalline sweetener that retains all the natural properties of the molecule found in fruit.
KG Allulose Syrup from KetoGoods is sourced from non-GMO corn via this enzymatic process and contains no fillers, flavorings, or additives. What is in the pouch is what it says on the label: pure allulose.
How Does Allulose Taste?
This is the question most people ask first, and the answer is the reason allulose has built such a loyal following. Allulose tastes clean and sweet, with no bitter aftertaste, no cooling sensation, and no strange chemical finish. It registers at about 70% of the sweetness of table sugar, so most recipes need a slight increase in quantity to hit the same sweetness level, but the flavor profile itself is the closest to real sugar of any currently available alternative.
The absence of aftertaste is particularly meaningful for anyone who has tried stevia (which leaves a bitter or licorice-like note for many people) or erythritol (which produces a noticeable coolness on the tongue, especially in baked goods served at room temperature). Allulose does neither. Real customers describe it as:
• "Tastes like sugar, with no aftertaste. I was shocked." -- William G., verified KetoGoods customer
• "I tried it in my coffee and it just tasted like sweet coffee. Nothing weird." -- Verified KetoGoods customer
• "My husband drank his coffee and had no idea I used allulose instead of sugar." -- Verified KetoGoods customer
How Does Allulose Behave in Cooking and Baking?
This is where allulose truly separates itself from every other sugar substitute on the market. Most sweeteners fail in baking because they do not replicate the functional properties of sugar beyond sweetness. Sugar does a lot more than make food sweet. It caramelizes. It browns. It retains moisture. It contributes to texture and structure.
Allulose does all of these things. Specifically:
• It caramelizes and browns when heated, which is critical for cookies, glazes, BBQ sauces, and anything that relies on the Maillard reaction for color and flavor depth.
• It retains moisture in baked goods, which means your keto cookies, cakes, and muffins stay tender and do not dry out the way some erythritol-sweetened versions do.
• It dissolves completely in both hot and cold liquids, making it ideal for sweetening iced coffee, cold brew, and beverages without any gritty residue.
• It does not crystallize the way erythritol does when cooled, which matters enormously in sauces, ice cream, and frostings.
One note for bakers: allulose does brown more readily under heat than regular sugar, so watch your oven temperature. A small reduction of 10-15 degrees Fahrenheit, or slightly shorter bake times, is often all that is needed to achieve the results you expect.
Does Allulose Spike Blood Sugar?
No. This is the question that matters most to people managing diabetes, prediabetes, or following a low-carb or ketogenic diet, and the answer is unequivocal. Allulose does not raise blood glucose or insulin levels in human clinical studies. It has been consumed by people with Type 1 and Type 2 diabetes without meaningful glycemic impact, and it is widely used in diabetic-friendly food formulations precisely because of this property.
The FDA's recognition of allulose as GRAS is not a technicality. It reflects genuine safety data. And the decision to exclude it from Added Sugars on the Nutrition Facts panel reflects the agency's acknowledgment that it simply does not behave like metabolizable sugar in the body.
For those tracking net carbs on a ketogenic diet: allulose does not count toward net carbs. For those monitoring blood glucose: it does not register. It is one of the very few sweeteners where both of those statements are true simultaneously.
Is Allulose Gentle on Digestion?
Yes, for the vast majority of people at normal usage amounts. Allulose is not a sugar alcohol, which means the mechanism behind erythritol and xylitol's digestive side effects does not apply. Most of the allulose you consume is absorbed in the small intestine and excreted before it reaches the colon, so it has very limited fermentation potential.
At very high single-serving amounts (generally above 40 to 50 grams), some individuals have reported mild digestive sensitivity. This is not unusual for any sweetener consumed in large quantities, and it is well outside the range of typical use. At normal amounts -- a tablespoon in coffee, a few tablespoons in a baking recipe -- the overwhelming majority of users report no digestive issues whatsoever.
Allulose vs. Other Sweeteners
To help put allulose in context, here is a quick comparison with the alternatives most commonly used in keto and sugar-free communities:
• Allulose vs. erythritol: Allulose has no cooling aftertaste, does not crystallize in cool applications, and performs better in caramelization. Erythritol can cause digestive distress in large amounts; allulose is generally better tolerated.
• Allulose vs. stevia: Allulose has a clean, neutral flavor. Stevia has a bitter or licorice aftertaste for many people and does not provide the functional baking properties allulose does.
• Allulose vs. monk fruit: Most monk fruit products are primarily erythritol with a small amount of monk fruit extract. Allulose is a singular ingredient. Allulose is also functionally superior for cooking and baking.
• Allulose vs. sucralose: Sucralose is an artificial sweetener with ongoing debate about its effects on gut bacteria and insulin response. Allulose is a naturally occurring sugar molecule with strong safety documentation.
How to Use Allulose Syrup
KG Allulose Syrup from KetoGoods is a liquid format, which makes it particularly versatile. Here are the most common uses:
• Sweetening beverages: coffee, tea, iced drinks, smoothies, protein shakes. Use the same amount you would use of a simple syrup.
• Baking: works in cakes, cookies, muffins, and quick breads. Because allulose is about 70% as sweet as sugar, you may want to increase the amount by roughly 30% relative to a sugar-based recipe, or combine with a small amount of monk fruit extract to hit a 1:1 sweetness ratio.
• Sauces and glazes: BBQ sauce, teriyaki, salad dressings, and pan sauces all work beautifully with allulose, and the caramelization behavior is a genuine advantage here.
• Ice cream and frozen desserts: allulose does not re-crystallize when frozen, which gives homemade keto ice cream a smoother, creamier texture than erythritol-based recipes typically achieve.
• Marinades and brines: the syrup form dissolves instantly with no heat required.
Why KetoGoods Allulose?
KetoGoods has supplied KG Allulose Syrup to both retail customers and food manufacturers since 2019. The product is 100% pure liquid allulose with no fillers, no flavors, and no artificial ingredients. It is Non-GMO, Kosher, Vegan, and Gluten-Free certified, and is available in sizes from 16oz units through 40oz pouches, 5 lb units, and 50 lb commercial containers for wholesale use.
If you have tried allulose from another brand and were not satisfied, or if this is your first time, KetoGoods stands behind every order with a 30-day money-back guarantee. Try it in your coffee first. Then make something you have been missing.