Strip all added sugar from a gummy line and sweeten only with erythritol and stevia, and the texture and shelf life constraints show up immediately. Sugar supplies bulk, holds moisture, and keeps crystallization in check. Erythritol and stevia bring sweetness and little else, so reformulation and process changes become unavoidable. With literally only erythritol and stevia (plus gelling agent and water), the result is gritty, fast-setting, and quick to dry out. Most of the practical fixes bring other ingredients back into the formula, so a finished sugar-free gummy is rarely just erythritol and stevia.
Texture constraints
Loss of bulk and structure
Sugar gives gummies their volume and chew. Erythritol is only about 60–70% as sweet as sucrose, and while it does add bulk, it cannot reproduce sugar's moisture-holding and body-building behavior. Stevia is intensely sweet but adds effectively no bulk. With only those two, the gummy turns soft, brittle, or crumbly. So formulators bring in bulking agents like polydextrose, isomalt, or soluble corn fiber to rebuild volume and chew.
Crystallization and mouthfeel
Erythritol recrystallizes readily as it cools, giving the gummy a gritty, sandy feel that customers notice right away. Water activity and temperature shifts during production and storage make it worse. Stevia won't crystallize, but it won't stop erythritol either. To fight it, formulators blend erythritol with other polyols like maltitol or allulose, or add stabilizers like gum arabic or pectin. Even then, the texture is often less smooth than sugar gummies. Erythritol also brings a strong cooling sensation in the mouth, a result of its high negative heat of solution. That suits mint products but can read as an off-note in fruit gummies, and it does nothing to soften the graininess.
Chewiness and gel strength
Sugar-free gummies depend on hydrocolloids like gelatin, pectin, or agar for their gel network. Sugar acts as a plasticizer, slowing gel setting to give that soft, elastic chew. Without it, the gel sets faster and can get too firm or rubbery. Using just erythritol and stevia often gives you either a hard lump or a fragile mess. Balancing the hydrocolloid type and amount is the main lever here, and even then the chew may be shorter and less pleasant than sugar gummies.
Shelf life constraints
Moisture control and hygroscopicity
Sugar holds onto moisture, keeping gummies soft. Erythritol doesn't. It has low hygroscopicity, so it attracts and holds almost no water. That means sugar-free gummies lose moisture fast, hardening and cracking within weeks. Stevia adds no moisture retention. To fight this, you need humidity-resistant packaging (high-barrier films) and humectants like glycerin or sorbitol. Even with those, sugar-free gummies tend to lose eating quality faster than sugar gummies. Hardening and recrystallization can appear within months, well before the product becomes unsafe to eat, while a stable sugar gummy often holds its texture for a year or more.
Risk of crystallization over time
The crystals that form during production don't stop growing in storage, especially if temperatures fluctuate. That makes the gummy even grainier. Stevia doesn't cause crystals, but it can't stop them either. Store at stable, cool temperatures below 25°C/77°F. Blending with allulose or a bit of fiber helps, but shelf life is still a compromise.
Microbiological stability
Sugar preserves gummies by binding free water and pulling water activity low enough that molds and yeasts can't grow. Erythritol binds some water, but a sugar-free formula built on humectants can still sit in the range where osmophilic yeasts and molds survive. Preservatives like potassium sorbate are added to low-sugar products for this reason. Keep water activity below about 0.60 for a long shelf life, and pair the preservative with acidification from citric acid.
Sweetener cost and supply risk
Sweetener choice also moves the bill of materials, and the two sweeteners here carry opposite economics: stevia is high-cost but dosed in tiny amounts, while erythritol is low-cost but used at bulk levels. Supply carries its own exposure. In 2025 the U.S. Department of Commerce issued a preliminary affirmative determination in its antidumping investigation of erythritol from China, and the U.S. International Trade Commission voted to continue the case, with final determinations due by December 1, 2025. Duties on Chinese erythritol would flow straight into sugar-free gummy costs, so a brand comparing quotes should ask a manufacturer how sweetener contracts are priced and whether supply is diversified. A formula built on a single imported bulk sweetener layers cost risk on top of the texture problems above.
Key takeaways for manufacturers
- Texture: Expect a gritty mouthfeel from erythritol crystallization, a faster gel set, and a potentially brittle or overly firm chew. Alternative bulking agents and stabilizers are mandatory.
- Shelf life: Moisture loss leading to hardening is the primary challenge, followed by recrystallization and microbial risks. Use high-barrier packaging, humectants, and preservatives to extend stability.
- Process adjustments: Lower processing temperatures and precise cooling rates help minimize crystallization. Always test thoroughly with a food scientist experienced in sugar-free confectionery.
You can make a gummy sweetened only with erythritol and stevia, but it won't match a sugar gummy without substantial reformulation and packaging upgrades. Texture degradation from crystallization and rapid moisture loss are the two dominant constraints, and both demand careful ingredient choices and tight process control.