If you're making gummy supplements, humidity is one of those things that can quietly wreck everything. Too much moisture and your gummies stick together, get mushy, or even grow mold. Get it right, though, and they'll stay chewy, stable, and shelf-ready from production to the consumer's hands. Here's how to keep humidity under control.
Why Humidity Matters
Gummies are basically sponges. They pull moisture from the air, which causes a cascade of problems:
- Sticking and clumping: Excess moisture makes gummies stick together in bulk or in packaging.
- Texture goes off: They get too soft, lose that chew, or dry out and turn hard.
- Microbial growth: High moisture invites mold and bacteria, which is a safety risk.
- Ingredients degrade: Active ingredients and vitamins can break down.
- Packaging trouble: Labels peel, seals fail.
How to Tackle It
1. Control the environment
Cooling, demolding, and packaging zones need the tightest climate control. Use industrial dehumidifiers and HVAC to keep relative humidity between 30–45% (the exact target depends on your formula), and hold the drying room around 60–70°F; warmer air holds more moisture at the same RH. Monitor continuously with calibrated hygrometers, and seal the facility so outside air doesn't sneak in.
2. Tweak your recipe and process
Start with your formulation. Use humectants like sorbitol or glycerin to manage water activity, but keep the level low; too much leaves the surface tacky. Starches and gums can help bind water too. Water activity is the number that matters. Most gummies target 0.55 to 0.70, near the 0.60 mark where mold and yeast generally stop growing. After depositing into molds, a controlled drying or curing stage removes surface moisture and sets the texture. A light dusting of modified starch after demolding reduces stickiness. A sour citric acid-sugar coating needs full curing first or encapsulated citric acid; anhydrous citric acid pulls moisture from the air and turns the surface tacky.
3. Lock it in with packaging
Even if you nail production, bad packaging can ruin everything. Choose high-barrier materials, such as foil-lined pouches, stick packs, or bottles with desiccant inserts. Make sure your packaging equipment seals completely. For bulk containers, consider nitrogen flushing to displace oxygen and residual moisture.
Case Hardening and Over-Drying
Humidity control cuts both ways. Run the drying room too dry, or cure the batch too long, and you create the opposite defect. The surface dries first and forms a skin while the center stays soft, and taken far enough that becomes case hardening: a dry crust that traps moisture inside, leaving the center wet under a dry surface. The batch later cracks, shrinks, or turns hard in the package.
Pull the batch when the meter reads spec, then move to packaging before the dry room keeps pulling moisture out. A batch that's already hit target but sits another day in low humidity will keep drying and drift into the brittle range.
Get the Right Partner
You don't have to figure this out alone. An experienced supplement manufacturer brings purpose-built facilities with proper climate controls, proven formulations, and validated packaging. They'll help you deliver a consistent, high-quality gummy that your customers will love.