At KorNutra, we've seen it firsthand: gummy texture is a delicate balance. Humidity control decides whether a gummy comes out firm and tender or sticky and brittle. Here's how we keep it steady at every stage.
The Critical Role of Humidity in Gummy Manufacturing
Gummy supplements are hygroscopic: they pull moisture from the air. Poor humidity control means trouble, and our facilities use controlled systems that hold humidity within a tight range at every stage, from mixing to packaging.
The metric we control is water activity (aw): the free, unbound moisture left in the gummy itself. Most gummies stay stable in an aw window of roughly 0.5 to 0.75. Outside that window, the gummy trades moisture with the air around it. Texture and shelf life drift.
Consequences of Poor Humidity Control
- Excessive Moisture Absorption: With too much humidity, gummies turn sticky, fuse together (a defect we call "blocking"), and feel mushy.
- Excessive Moisture Loss: With too little, they get hard, brittle, or even crack. The tender bite disappears.
How We Keep It Consistent
- Ingredient Processing: Raw materials like gelatin and sugars are stored in climate-controlled areas so moisture stays stable before production.
- Cooling and Setting: After molding, gummies set in a tunnel with tight temperature and humidity control. This locks in the initial texture.
- Drying and Curing: The most humidity-sensitive phase. We dry off surface moisture until the gummy hits its target water activity, so it comes out stable and non-sticky and holds that texture on the shelf.
- Packaging: Gummies go straight into moisture-barrier packaging in a low-humidity room. That seals in the ideal texture and keeps it that way.
Water Activity and Shelf Life
Texture is the part you can feel, but water activity also sets how long a gummy stays stable. Mold and some yeasts can grow once aw climbs above roughly 0.6, so shelf-stable gummies are dried below that line and kept there. Moisture drives degradation of sensitive actives too: water-soluble vitamins like C and the B vitamins break down faster in humid conditions, and a batch that tests fine at release but runs high on moisture can drift off-spec for potency months later.
Every batch comes out with the same texture: firm enough to hold shape, tender enough to enjoy. No surprises, from the first gummy to the last. Humidity control is one part of how we make supplements you can count on.