Agar agar vs xanthan gum: which should you choose? A practical guide
Choosing between agar agar and xanthan gum for thickening or gelling? This guide compares texture, temperature, pH and application, from sweet and savoury dishes to mixology.
At a glance
- Agar agar: a vegan gelling agent for firm, sliceable gels. Bring it to the boil; it sets at 40–45 °C. Ideal for jellies, panna cotta, jams, veils and clean slices.
- Xanthan gum: a cold thickener and stabiliser. Creates viscosity and creaminess without gelling. Ideal for sauces, coulis, dressings, drinks, ice creams and particle suspension.
Discover agar agar · Discover xanthan gum
Comparison table
| Characteristic | Agar agar | Xanthan gum |
|---|---|---|
| Main function | Gelling: firm, rigid, sliceable gels | Thickening/stabilising: creaminess, suspension |
| Activation | Boil for 1–2 minutes, around 90–100 °C | Hot or cold; blend/disperse |
| Setting/service | Sets at 40–45 °C; heat-resistant to around 85 °C | Does not gel; remains fluid or creamy when cold |
| Typical dosage | 2–10 g/L; 7–10 g/L for firm gels | 0.05–0.8%, or 0.5–8 g/L, depending on viscosity |
| pH sensitivity | Below pH 4.5, increase dosage or balance pH | Stable across a wide pH range |
| Mouthfeel/texture | Clean, transparent gels with a crisp bite | Silky creaminess and body without aftertaste |
| Key applications | Gelled desserts, terrines, cubes, spheres/veils, jams | Sauces, coulis, toppings, drinks, ice creams, emulsions |
When to use agar agar
- Gels and clean slices: puddings, panna cotta, fruit jellies and vegetable terrines.
- Warm preparations: retains structure on buffets and in hot dishes.
- Food design: crisp dried sheets, glossy veils and gel noodles.
Tip: highly acidic ingredients such as citrus or tomato weaken gels; slightly increase dosage or balance pH.
Buy agar agar in several pack sizes
When to use xanthan gum
- Cold thickening: shakes, smoothies, uncooked sauces, coulis and dressings.
- Stabilising: suspends spices and particles, prevents syneresis and supports emulsions.
- Ice creams and sorbets: improves body and reduces ice crystals alongside other stabilisers.
Tip: use low percentages, 0.1–0.3%, to avoid excessive elasticity. Disperse thoroughly with a blender.
Useful combinations
- Agar agar + xanthan gum: more stable, less brittle gels with clean slices and a silkier mouthfeel.
- Agar agar + kappa/iota: adjust from a crisp bite with kappa to elasticity with iota.
Quick decision
- For solid, sliceable gel: agar agar.
- For creaminess and stability without gel, even cold: xanthan gum.
- For creamier, less brittle gel: agar agar with a little xanthan gum.
Quick FAQs
Can I boil xanthan gum?
Yes, it is heat-resistant, but heating is unnecessary. Avoid high doses that produce stringiness.
Does agar agar work with citrus?
Yes, but strong acidity requires higher dosage or pH adjustment for reliable setting.
How do I avoid xanthan lumps?
Pre-mix with sugar or oil, blend at high speed and allow 5–10 minutes to hydrate.
Buy from Special Ingredients
Bonus tip: try our agar agar dosage calculator to calculate grams based on litres, pH and texture.