Getting moisture right is the difference between a chewy, stable gummy and a sticky mess or a brittle rock. At KorNutra, we've dialed in a multi-stage drying and curing process that delivers consistent results batch after batch.
Why Moisture Matters
Too much free water and you get microbial growth, ingredient breakdown, and a sticky surface. Too little and the gummy turns hard. The real driver of spoilage is water activity, which is not the same thing as moisture content: sugars and other dissolved solids bind water, so a gummy can measure 10 to 20 percent moisture and still sit at a water activity too low for spoilage organisms. Most bacteria stop growing below a water activity of about 0.85, and molds and yeasts below about 0.60. We aim for the equilibrium that gives a clean chew while keeping water activity low enough to protect the actives.
Our Drying and Curing Process
Once the gummies are molded, they move into an environment set up to draw excess water off the surface and out of the center in a controlled way.
1. Drying
This phase targets free surface moisture. Gummies move through temperature- and humidity-controlled drying tunnels. We keep tight control over three variables:
- Airflow: Consistent, laminar air means even drying across the whole batch.
- Temperature: Gentle, specific temperatures drive off water without damaging heat-sensitive ingredients or melting the gummies.
- Humidity: We dial in the relative humidity of the drying air to control the rate of moisture removal and avoid case-hardening (where the outside dries too fast, trapping water inside).
2. Curing
Curing is drying, but slower. It lets moisture equalize inside the gummy, which is key for final texture and stability.
- Conditioned Environment: Gummies rest in a room with tightly controlled temperature and humidity for a set period.
- Moisture Migration: This pause allows internal water to move to the surface and evaporate, giving you a uniform texture throughout.
- Starch or No Starch: Depending on the line, gummies cure in a bed of conditioned starch or on open trays. In starch molding, the starch wicks surface moisture away and is then dried and reused. On a starchless line, the conditioned room air does the drying work directly.
How the Gelling Agent Changes the Moisture Target
Moisture is not one number across every SKU. Different gelling agents need different targets. Pectin gels hold more water than gelatin, and raising the pectin share in a pectin/gelatin gummy increases both moisture content and water activity in the finished piece. A pectin line therefore needs different drying conditions and different release specs than a gelatin line. Pectin has also become the standard plant-based choice: in 2023, more than 55 percent of new gummy launches used pectin alone or blended with another plant-based gelling agent. For a brand, the practical point is that the formulation and the drying program are set together. You do not hand a fixed moisture spec to a manufacturer and expect it to fit a gelatin sleep gummy and a pectin multivitamin equally.
Quality Checks and Precision Measurement
We don't fly blind. Moisture analyzers take precise readings at multiple stages, and we check water activity alongside total moisture. Every batch has to hit both targets before it moves to packaging, because moisture content alone won't tell you whether the product will stay stable on the shelf.
With precise environmental controls, staged processing, and rigorous testing, KorNutra delivers consistent texture and stability from the first gummy to the last.