Zero Sugar Energy Drinks: What's Actually Sweetening Your Can

"Zero sugar" is doing a lot of work on the front of that can. Here is what it actually means: no sucrose, no glucose, no high fructose corn syrup. Here is what it almost never means: unsweetened. Nearly every zero sugar energy drink is intensely sweet, sometimes sweeter-tasting than the sugared version, because something else is doing the sweetening. This post is a field guide to what that something is, written neutrally, so the next label you read makes sense in ten seconds.

Why zero sugar cans still taste like candy

Energy drinks grew up as a candy-adjacent category. Consumers expected sweet, brands delivered sweet, and when sugar fell out of fashion the sweetness stayed and only the source changed. High-intensity sweeteners made that swap easy: compounds hundreds of times sweeter than sugar, used in tiny amounts, contributing zero or near-zero calories. Nothing sneaky about it legally. It is all on the label, in small print, usually after "natural flavors." You just have to know the names.

The five names you'll see on almost every can

Sucralose. A modified sugar molecule, roughly 600 times sweeter than sugar. The workhorse of the category. Alani Nu lists it, Celsius lists it, and so do many others. That is a label fact, not a judgment.

Acesulfame potassium (ace-K). A synthetic sweetener around 200 times sweeter than sugar. Rarely flies solo; usually paired with sucralose or aspartame to round out the taste.

Aspartame. Made of two amino acids, about 200 times sweeter than sugar. The classic diet soda sweetener. Sugar-free Red Bull uses aspartame with ace-K, per its label.

Stevia (steviol glycosides). Extracted from the stevia plant, roughly 200 to 300 times sweeter than sugar. Marketed as the natural option, though the extraction is very much an industrial process, and its licorice-adjacent aftertaste is famously divisive.

Erythritol. A sugar alcohol at about 70 percent of sugar's sweetness, often used as a bulking partner for the intense sweeteners above. Shows up constantly in "naturally sweetened" formulas.

The cheat sheet

To be fair to everyone on that table: regulators permit all of these, and enormous numbers of people consume them daily without a second thought. We are not telling you any of them will hurt you. We are telling you they are there, because a lot of people have no idea.

The sixth option: monk fruit, used lightly

There is another way to build a zero sugar drink: skip the artificial stuff entirely and use a light touch of monk fruit, a zero-calorie fruit extract. That is Josie. The full ingredient list is carbonated water, Lion's Mane mushroom, Cordyceps mushroom, Vitamin B12, 65mg of natural caffeine from green tea, monk fruit, and natural flavors. No sucralose, no ace-K, no aspartame, no erythritol. The monk fruit is there for balance, not to make the can taste like a candy shop. You can read the entire label on our ingredients page.

Set your taste expectations honestly: Josie lands closer to a flavored sparkling water than a melted popsicle. Real fruit flavor, real bubbles, no wall of sweetness. If your palate has been living at 600x sugar, the first can is an adjustment. By the third can, most people stop missing the frosting. The mushrooms, for the record, come with soft, honest framing only: Lion's Mane is traditionally used for focus, Cordyceps is traditionally used for endurance, and the reasoning is laid out on the science page.

How to read any energy drink label in ten seconds

• Ignore the front of the can entirely. It is marketing real estate.
• Find the ingredient list and scan the back half, where sweeteners live.
• The names to spot: sucralose, acesulfame potassium, aspartame, steviol glycosides, erythritol.
• If none of them appear and sugar is zero, you are holding an actually unsweetened drink. It is a short list.

FAQ

What sweetener is in most zero sugar energy drinks?

Sucralose is the most common, often paired with acesulfame potassium. Brands positioning as natural typically use stevia, frequently blended with erythritol. Check the last few lines of the ingredient list.

Is stevia an artificial sweetener?

Stevia is extracted from a plant, so it is usually labeled a natural sweetener, but the purified steviol glycosides in your can are the product of serious industrial processing. Natural origin, engineered result. It is still a sweetener either way.

What sweetener does Josie use?

Monk fruit, a plant-derived zero-calorie fruit extract, used lightly. No sucralose, no ace-K, no aspartame: 65mg of green tea caffeine, zero sugar, zero calories, sold at drinkjosie.com, Amazon, and TikTok Shop.

Once you see the sweetener list, you cannot unsee it. Taste the difference: start with Mixed Berry or grab the variety pack and read our label as slowly as you want. No sugar. No calories. No weird stuff.