Gellan gum is a food additive used to thicken, stabilize, and gel liquids. You’ll find it in plant-based milks, jellies, sauces, and dozens of other products, where it works at remarkably low concentrations, typically less than 0.5% of the total product. It’s produced by fermenting sugars with a specific bacterium, and it has FDA approval as a safe food ingredient.
How Gellan Gum Is Made
Gellan gum comes from a bacterium called Sphingomonas elodea (originally classified as Pseudomonas elodea). During fermentation, these bacteria consume sugars like glucose, sucrose, or fructose and produce a gel-like polysaccharide as a byproduct. The process runs at around 30 to 31°C with a slightly neutral pH of 6.8 to 7.4, and production peaks after about 72 hours. Optimizing oxygen levels during fermentation can push yields as high as 23 grams per liter of culture.
After fermentation, the raw gellan is harvested from the culture medium. In its natural state, the polymer contains bulky chemical groups (acetyl and glyceryl) attached to its sugar backbone. To produce the most commonly used commercial form, manufacturers treat it with heat and an alkaline solution to strip those groups away. The result is a fine powder that dissolves in hot water and forms gels as it cools.
Two Types: High Acyl vs. Low Acyl
Gellan gum comes in two forms, and the difference matters for texture. High-acyl gellan retains those natural acetyl and glyceryl groups on the sugar chain. These bulky groups prevent the polymer chains from packing tightly together, so the gels it forms are soft, elastic, and flexible. They feel similar to the bouncy texture of gummy desserts.
Low-acyl gellan has those groups removed. Without them, the polymer chains can pack closely and form firm, brittle gels that snap cleanly when you bite into them. Low-acyl gellan also needs to be dissolved at temperatures above 90°C and requires minerals (like calcium or potassium) in the solution to gel properly as it cools. High-acyl gellan, by contrast, gels at higher temperatures and doesn’t depend as heavily on added minerals.
Food manufacturers often blend the two forms together. By adjusting the ratio, they can dial in textures anywhere from soft and spreadable to firm and sliceable. Mixed gels tend to be more deformable than pure low-acyl gels while maintaining similar strength.
Where You’ll Find It in Food
Gellan gum shows up across a wide range of products. Plant-based milks use it to keep particles suspended so the liquid doesn’t separate in the carton. Jams and jellies rely on it for a clean, clear set. Confectioners use it to create transparent, heat-resistant gels that hold their shape better than those made with gelatin or agar. You’ll also find it in salad dressings, flavored waters, yogurt alternatives, and even some canned foods.
One reason it’s so popular in manufacturing is efficiency. Gellan gum works at concentrations up to 80% lower than many other gelling agents, which means a tiny amount goes a long way. It also produces highly transparent gels, which is useful when appearance matters, like in clear beverages or glossy dessert glazes. Its heat stability outperforms gelatin and holds up better than agar in certain formulations, making it a practical choice for products that need to withstand warming or reheating.
How It Compares to Other Gums
Xanthan gum, probably the most familiar thickener on ingredient labels, works primarily as a thickener and stabilizer. It excels at keeping mixtures uniform and preventing ingredients from separating, but it doesn’t form true gels the way gellan does. Gellan gum can do both: thicken a liquid or set it into a solid gel, depending on concentration and conditions. Gellan also offers better heat stability than xanthan.
Agar, derived from seaweed, forms firm gels but tends to be brittle and less heat stable in some applications. Gellan bridges that gap by producing gels that can range from elastic to firm depending on the acyl type, while tolerating higher temperatures. Gelatin, which comes from animal collagen, melts at body temperature and isn’t suitable for vegan products. Gellan gum is fully plant-free and vegan, making it one of the go-to replacements in dairy-free and plant-based foods.
Uses Beyond Food
Gellan gum has found a significant role in pharmaceuticals. Its ability to form gels when it contacts the natural salts in body fluids makes it especially useful for eye drops. A liquid gellan solution applied to the eye turns into a soft gel on contact, allowing the medication to stay in place longer rather than draining away immediately. This “in situ gelling” property also applies to nasal sprays and oral formulations where extended contact time improves how well a drug is absorbed.
In tissue engineering, gellan gum serves as a scaffold material, providing a structure that cells can adhere to and grow on. Its compatibility with living tissue, combined with its tunable gel strength, makes it a practical base for building experimental tissue constructs. Researchers also use it to create controlled-release capsules, beads, and nanoparticles that deliver drugs gradually over time rather than all at once.
Safety and Digestive Effects
Gellan gum is classified as Generally Recognized as Safe (GRAS) by the FDA under regulation 21 CFR 172.665, where it’s approved as a stabilizer and thickener. It’s also approved in the European Union (listed as E418) and in many other countries.
In the digestive system, gellan gum passes through largely undigested, functioning somewhat like a soluble fiber. Some small studies have suggested it may help relieve constipation by adding bulk to stool and helping food move through the gut more smoothly. However, this evidence is limited and results have been mixed, so digestive benefits likely vary from person to person. On the other hand, because gellan gum can slow digestion in some individuals, people who notice bloating or discomfort after consuming products containing it may want to pay attention to how much they’re taking in.
At the concentrations used in commercial foods, well below 0.5%, gellan gum is consumed in very small quantities. For most people, the amount present in a glass of almond milk or a serving of jam is negligible from a nutritional standpoint.