Combining the depositing step with vacuum, a technique we call vacuum depositing, is one of the most effective ways to improve both the clarity and texture of your finished supplements. At KorNutra, we often recommend this approach to clients who seek a premium, air-free product appearance and a smoother mouthfeel.
When you deposit liquid or gel blends under vacuum, trapped gases are pulled out before the product sets. This directly reduces air bubbles, which are a common cause of cloudiness, surface pitting, and uneven texture.
Improved clarity
Air bubbles scatter light, making transparent or translucent supplements look hazy or milky. Vacuum depositing removes these micro-bubbles, allowing light to pass through unobstructed. The result is a crystal-clear product, ideal for softgels, chewable gels, or liquid-filled capsules where visual appeal matters.
Improved texture and consistency
Without air pockets, the final texture becomes more uniform and dense. You’ll see fewer voids or soft spots, and the product will feel smoother when handled or consumed. This is especially beneficial for gummies or gelcaps, where a consistent, almost silky texture is a sign of high quality.
- Eliminates surface defects: no bubble craters or rough spots after solidifying.
- Reduces oxidation: less trapped air means lower risk of ingredient degradation over time.
- Improves weight consistency: filling is more precise because there’s no gas taking up space.
Process considerations
To achieve these benefits, the vacuum must be applied during the depositing step, not just after. The liquid or molten mass is held under a controlled vacuum while it’s dispensed into molds or capsules. This ensures bubbles are removed from the bulk material before it sets, rather than relying on a separate degassing step that might reintroduce air. The vacuum level has to match the batch. Pull too hard on a warm, low-viscosity mix and it can foam or surge in the depositing head, which adds bubbles instead of removing them. The setting is tuned to the batch’s viscosity and temperature so gas escapes without boiling the carrier.
What not to expect
Vacuum depositing won’t change the inherent clarity of your ingredients. If the base formulation itself is cloudy (e.g., from natural oils or suspended particles), the final product may still have a slight haze. For clear or transparent formulas, vacuum depositing removes nearly all visible bubbles.
Moisture and flavor loss under vacuum
Vacuum doesn’t only remove air. Under reduced pressure, water and light volatile flavor compounds boil off at a lower temperature, so the vacuum can draw off part of the batch’s moisture and some of its top notes during the hold. For gummies, moisture content is a finished-product specification, and a shift in it changes how the gel sets and how the piece feels on the tongue. If vacuum depositing lowers the moisture below target, the batch may need a shorter hold time, a gentler vacuum, or a small water adjustment in the formula before scaling up.
Flavor systems need the same recheck. Esters, aldehydes, and terpenes are the light compounds behind many fruit and citrus notes, and vacuum evaporation is known to pull them away with water vapor. A flavor profile that passes on a standard line can read flatter after vacuum depositing if those top notes are lost. Run a pilot batch, measure moisture and solids, and taste against the current control before committing the full formula. When the vacuum is dialed in, the gain in clarity does not have to cost you flavor.
At KorNutra, we integrate this technique into our custom manufacturing workflows to help you achieve a clean, bubble-free finish. If you’re exploring options for your next supplement line, vacuum depositing is one way to improve the quality and visual appeal of your final product.