A polysaccharide produced by bacterial fermentation of sugar, sold as a fine cream-coloured powder. It thickens cold or hot liquids and is a standard structural ingredient in gluten-free baking.
What it does in a recipe: Enormous thickening and suspending power at tiny doses, effective without cooking. Pick the swap that covers that job — the ratios below are written so you can act on them without doing any arithmetic.
Also called: E415
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Quick answer
Guar gum
1 tsp xanthan gum = 1.5 tsp guar gum
All substitutes, best first
4 ways to replace xanthan gum
Guar gum
Reliable
1 tsp xanthan gum = 1.5 tsp guar gum
Another cold-soluble hydrocolloid from a plant source, guar thickens by the same tangling mechanism but is somewhat weaker by weight, so it takes about half again as much.
MethodDisperse it while blending, exactly as with xanthan — dumped in dry it clumps just as badly.
Trade-offLess tolerant of acid than xanthan, so it weakens in a citrus or vinegar-heavy preparation. It can also give a slightly beany note at higher doses.
Allergen checkGuar comes from a legume. Legume allergy is uncommon but real, and people with severe peanut or soy allergy occasionally react to other legumes — worth flagging rather than assuming.
Cornstarch
Reliable
1/4 to 1/2 tsp xanthan gum = 1 tbsp cornstarch (as a slurry, cooked)
Cornstarch reaches a similar viscosity by gelatinising its granules in heat, which is a different mechanism but the same practical result in a sauce or gravy.
MethodUnlike xanthan it must be slurried in cold liquid and then cooked, so it cannot thicken a cold dressing.
Trade-offWill not suspend particles or hold an emulsion the way xanthan does, and it does nothing at all in a gluten-free bread dough, where xanthan is providing structure rather than thickness.
Psyllium forms a strong gel in water and gives gluten-free doughs genuine elasticity and stretch, which is closer to what gluten actually does than xanthan manages.
MethodLet the dough or batter rest 10 minutes after mixing so the husk fully hydrates before baking.
Trade-offAdds a faintly earthy flavour and a greyish tinge, and it makes a bread crumb noticeably moister and denser.
1 tsp xanthan gum = 1 tbsp ground chia or flaxseed soaked in 3 tbsp water
Both seeds release soluble fibre mucilage when soaked, forming a viscous gel that binds and thickens in much the same way, though considerably more weakly.
MethodSoak for at least 10 minutes until visibly gelled before adding to the mixture.
Trade-offSpeckles the finished product, adds a nutty flavour, and will not hold a smooth sauce clear or glossy.
Xanthan is powerful enough that measuring by eye is a mistake. Roughly 1/4 to 1/2 tsp replaces a tablespoon of cornstarch, and going past that produces a slimy, ropey, mouth-coating texture that cannot be undone — you can only dilute the whole batch. Add it gradually while blending, wait a full minute for it to hydrate before judging, and remember that it keeps thickening slightly as it stands.
Cooking around an allergy? Diet tags here describe the ingredient itself, not any particular brand. Processed products change formulation without notice and shared production lines are common, so read the label on everything you use. A severe allergy is a medical matter — confirm with the manufacturer or your clinician rather than relying on a substitution chart.