What Is Pullulan? The Film Behind Dissolvable Supplement Strips
Published: May 11, 2026
Reading time: 5 minutes
Pullulan is the material that makes dissolvable supplement strips possible. It's a thin, flexible, edible polysaccharide film that holds active ingredients in suspension, dissolves under the tongue in about 30 seconds, and leaves no aftertaste or residue. Most consumer-facing supplement strip brands in 2026 — including Xyne — use pullulan as their carrier substrate.
This guide covers what pullulan is, where it comes from, and why the supplement industry shifted to it as the dominant film material.
What pullulan is, technically
Pullulan is a polysaccharide — a chain of sugar molecules — produced by fermenting a yeast-like fungus called Aureobasidium pullulans on a sugar substrate. The fungus secretes pullulan into its environment as a byproduct. The pullulan is then harvested, purified, and dried into a fine white powder, which can be cast into thin films.
In its film form, pullulan has three properties that matter for supplement delivery:
- It dissolves rapidly in water and saliva — typically within 30 to 60 seconds at body temperature
- It's effectively flavorless and odorless in its purified form
- It forms a strong oxygen barrier when dry, protecting moisture-sensitive actives from degradation
Where pullulan comes from
Pullulan is plant-derived in the sense that the source organism (a fungus) is fermented on plant-based sugar substrates, typically corn or tapioca starch. The pullulan itself is not an animal product. Most pullulan on the supplement market is certified vegan and non-GMO.
The dominant commercial producer is Hayashibara, a Japanese specialty chemicals company that developed industrial-scale pullulan production in the 1970s and still supplies a substantial share of the global market. The FDA classifies pullulan as GRAS (Generally Recognized As Safe) for food use.
Pullulan vs gelatin vs HPMC
Three film and capsule materials dominate the supplement industry. Each has trade-offs:
| Material | Source | Vegan? | Typical use | Dissolve speed |
|---|---|---|---|---|
| Pullulan | Fermented fungus on plant sugar | Yes | Sublingual strips, capsules | ~30–60 seconds |
| Gelatin | Animal collagen (bovine or porcine) | No | Soft gel and standard capsules | Variable; slow |
| HPMC (hypromellose) | Modified plant cellulose | Yes | Vegetarian capsules | Moderate; pH-dependent |
For sublingual delivery specifically, pullulan is the only mainstream material that combines fast dissolution under the tongue with a clean taste profile and vegan certification.
Why the industry shifted to pullulan
Three reasons drove pullulan's rise as the standard for dissolvable supplement strips:
Consumer dietary preferences. Vegan, vegetarian, and kosher consumers increasingly require non-animal-derived supplement materials. Gelatin fails on all three counts.
Sublingual delivery feasibility. HPMC and similar plant cellulose materials work for capsule shells but don't form the thin, fast-dissolving films required for sublingual delivery. Pullulan does.
Stability for sensitive actives. Many supplement actives — particularly probiotics, certain vitamins, and adaptogens — degrade rapidly in the presence of oxygen and moisture. Pullulan's oxygen barrier properties extend shelf life meaningfully compared to alternatives.
What pullulan is not
A few common misconceptions worth clearing up:
- Pullulan is not a "preservative." It's the structural film holding the strip together. Any preservatives in a supplement strip are separate ingredients.
- Pullulan is not sweet. While derived from sugar via fermentation, the finished polysaccharide is effectively flavorless.
- Pullulan is not a digestive aid. It passes through the digestive tract without significant absorption or metabolic activity.
Where Xyne fits
All eight Xyne sublingual supplement strip SKUs use a pullulan-based film as the carrier substrate. For format-level depth, see the canonical sublingual strips vs capsules comparison.
Quick reference
Q: Is pullulan safe?
Pullulan is FDA GRAS-certified for food use and has decades of safety data from food and supplement applications. There are no known serious adverse effects from typical supplement-strip exposure levels.
Q: Is pullulan vegan?
Yes. Pullulan is produced by fermenting a fungus on plant-based sugars. No animal products are involved in commercial pullulan production.
Q: Is pullulan gluten-free?
Pullulan itself is gluten-free. Some pullulan products may be produced in facilities that handle wheat-derived starches — verify with the specific brand if gluten sensitivity is a concern.
Q: Does pullulan have calories?
Pullulan provides roughly 2 calories per gram, but supplement strips contain such small amounts (typically under 100 mg per strip) that the caloric contribution is negligible.
Q: How long is pullulan stable in supplement form?
Pullulan films typically maintain structural integrity and active ingredient stability for 18 to 24 months when stored in sealed packaging at room temperature.
