Alani Nu uses two artificial sweeteners across nearly all of its products: sucralose and acesulfame potassium. These zero-calorie sweeteners are the reason a can of Alani Nu energy drink contains 0 grams of sugar while still tasting sweet. Some flavors also include erythritol, a sugar alcohol that adds body and mouthfeel to the drink.
The Two Main Sweeteners
Sucralose is the primary sweetener in Alani Nu. It’s roughly 600 times sweeter than table sugar, so only a tiny amount is needed to produce a noticeably sweet flavor. You’ll find it listed near the end of the ingredient list on every Alani Nu energy drink and pre-workout product.
Acesulfame potassium (sometimes labeled “Ace-K”) is the second sweetener. It’s about 200 times sweeter than sugar and is commonly paired with sucralose in diet beverages because the two together produce a more balanced, rounded sweetness than either one alone. This combination is standard across the entire Alani Nu lineup, including flavors like Breezeberry, Cosmic Stardust, Hawaiian Shaved Ice, and Cherry Slush.
Erythritol in Select Flavors
Certain Alani Nu energy drink flavors, including Cherry Slush and Cosmic Stardust, add erythritol to the formula. Erythritol is a sugar alcohol found naturally in some fruits and fermented foods. It has about 70% of the sweetness of sugar but contributes almost no calories because your body absorbs it but doesn’t break it down for energy.
Erythritol isn’t just there for sweetness. It changes the texture of the drink, giving it a slightly thicker, more substantial mouthfeel compared to typical zero-sugar beverages. Not every flavor contains it, though. Breezeberry, for example, skips erythritol entirely. Alani Nu doesn’t use stevia or monk fruit in any of its energy drinks or pre-workout formulas.
Sugar and Carb Content
A 12-ounce can of Alani Nu energy drink has 0 grams of sugar and 5 grams of total carbohydrates. Those 5 grams come from other ingredients in the formula, not from the sweeteners themselves. Sucralose and acesulfame potassium contribute zero calories and zero carbs per serving.
How Safe Are These Sweeteners?
Both sucralose and acesulfame potassium are approved by the FDA. The acceptable daily intake for sucralose is 5 milligrams per kilogram of body weight per day. For acesulfame potassium, it’s 15 milligrams per kilogram. For a 150-pound person, that means you could consume about 340 mg of sucralose or roughly 1,020 mg of acesulfame potassium daily before exceeding those limits. A single energy drink contains far less than that.
That said, the long-term picture is less clear-cut than those safety thresholds suggest. Research has raised questions about whether these sweeteners affect gut bacteria. Animal studies have found that sucralose and acesulfame potassium can shift the balance of gut microbes in ways associated with metabolic disruption, and their effectiveness for weight loss remains debated despite their presence in countless “diet” products. None of this means one can of Alani Nu is harmful, but it’s worth knowing that zero-calorie sweeteners aren’t biologically inert just because they don’t contain calories.
The Aftertaste Factor
If you’ve tried Alani Nu and noticed a lingering artificial sweetness, you’re not alone. Sensitivity to the aftertaste of sucralose and acesulfame potassium varies widely from person to person, and it also varies by flavor. Online, consumers frequently call out Cherry Slush, Dream Float, Hawaiian Shaved Ice, and Tropsicle as flavors with a more pronounced artificial aftertaste. More tart or citrus-forward flavors tend to mask the sweetener taste better.
Some people also report that the sweeter, dessert-style flavors (cotton candy, slushes, Dream Float) can feel cloying or cause mild throat irritation, likely because the sweetener concentration is more noticeable when paired with rich, sugary flavor profiles rather than sour or fruity ones. If aftertaste bothers you, starting with one of the more tart options is a reasonable approach.