Inulin substitute

Best substitute

Allulose

Use the same amount by weight, then taste and reduce slightly as the inulin you are replacing

Best for keto syrups

Different taste

It depends which job the inulin is doing, because it does two unrelated ones. If it is feeding the yeast in a low-carb bread, replace it with one to two teaspoons of plain sugar or honey per loaf; the yeast consumes most of it during the rise, so very little is left in the baked bread. If it is there for bulk and gentle sweetness in a keto dessert, allulose is the closest swap at roughly 1:1, though allulose is sweeter, so pull back a little and watch it, since it browns fast. If it is there for fibre, body and moisture, psyllium husk powder at about a third of the amount, or oat fibre at 1:1, will hold the mixture together, though both taste earthier. Inulin is not really a sweetener: it is bulk, body and water-holding with about a third of the sweetness of sugar, and it is what makes a keto syrup pour thickly or a low-carb bar hold together. One genuine warning before you increase the amount in a recipe: inulin is a fermentable fibre and large amounts are well known to cause bloating, gas and cramping, so it is not something to scale up freely.

Other inulin substitutes

Ranked, with the exact amount to use

2Plain Sugar or Honey (for feeding yeast)
Close match
Use 1 to 2 teaspoons for every loaf, in place of the inulin
The answer when the inulin exists purely to give the yeast something to eat in a low-carb yeasted bread.
What changes
Best for
keto yeast bread, low-carb rolls, any yeasted low-carb dough
The rise and the yeasty aroma come out at least as good, often better, because yeast handles plain sugar more readily. Most of it is fermented away during proofing, so what remains across a whole loaf is very small. It will not replace inulin's bulk if the recipe also relies on that.
3Psyllium Husk Powder
Taste and texture differ
About ⅓ the weight of the inulin, plus a splash more liquid
A strongly gelling soluble fibre, the workhorse binder of keto baking.
What changes
Best for
keto bread, low-carb tortillas, fibre bars, thick doughs
Excellent at holding a dough together and locking in moisture, but it adds a distinctly earthy, wholemeal flavour and a denser, slightly springy crumb, and it adds no sweetness at all, so sweeten separately. Too much makes the texture rubbery and purple-grey.
4Oat Fibre
Taste and texture differ
Use the same amount by volume, plus your usual sweetener to taste
Insoluble fibre milled from oat hulls, used as near-flavourless bulk in low-carb baking.
What changes
Best for
keto bread, low-carb baking mixes, bulking flour blends, cookies
The closest thing to neutral filler: it replaces inulin's volume without its sweetness or its syrupy body, so a bar made with it feels drier and more crumbly. It is very thirsty, so add liquid gradually, and check the packet if you need certified gluten-free.
5Erythritol Plus a Little Vegetable Glycerine
Taste and texture differ
Use Erythritol 1:1 by weight for the sweetness, plus 1 teaspoon glycerine for every cup for the moisture
A two-part workaround, because erythritol alone gives sweetness but none of inulin's water-holding.
What changes
Best for
keto cookies, cakes, fudge, low-carb bars
Erythritol brings a noticeable cooling aftertaste and it recrystallises as it cools, so a fudge made this way turns slightly gritty where the inulin version stayed smooth. The glycerine keeps things chewy and helps mask the cooling effect.
6Dry Milk Powder or Whey Protein (for body in frozen desserts)
Different taste
Use the same amount by weight
Using protein rather than fibre to bind water in low-carb ice cream and shakes.
What changes
Best for
low-carb ice cream, milkshakes, protein desserts, creamy bases
It gives a genuinely creamy, scoopable result, but it tastes of dairy, adds a cooked or malty note, and brings some lactose carbohydrate with it, which pure inulin does not. Whey protein can also turn slightly chalky if overdone.

What is Inulin?

Inulin is Inulin is a soluble fibre powder or syrup extracted from chicory root, and sometimes from agave, that dissolves like sugar and tastes faintly sweet but is barely digested, which is why low-carb and keto recipes use it for bulk and body instead of sugar.

Cooking tips

Inulin caramelises and burns sooner than sugar. If you swap something in that browns faster still, such as allulose, drop the oven 15F to 25F and tent the top of anything baking longer than half an hour.
Dissolve it in warm liquid, not cold. Inulin powder goes into warm milk or water cleanly but clumps in cold liquid and sits on top of a batter as gritty specks.
It will not do sugar's structural tricks. It does not crystallise, so it cannot make a crisp snappy cookie or a hard candy; expect anything made with inulin to be soft and chewy, and choose recipes accordingly.
Start with half the amount if you have not baked with it before, both because it is more filling than it looks and because its digestive effects scale with the dose. This applies doubly if you are adding it to a recipe rather than following one.
Agave inulin and chicory root inulin are close but not identical: agave inulin is a little sweeter and dissolves slightly more readily, chicory inulin gives marginally more body. Either can replace the other 1:1 without changing a recipe.

Frequently asked questions

Can I just leave inulin out?

It depends on the job. In a low-carb yeast bread, no, because the yeast needs something to eat; put in a teaspoon of sugar instead. In a cake, bar or ice cream it is optional, and leaving it out gives you a drier, less sweet, slightly smaller result that still works. In a syrup it is the body, so without it you get thin, watery liquid.

Is inulin the same as chicory root fibre?

Yes, for cooking purposes. Chicory root fibre, chicory fibre and inulin powder are the same ingredient, since chicory root is where most commercial inulin comes from. Labels vary between brands, and they swap one for one.

Is inulin keto, and does it count as carbs?

Inulin is a fibre that human digestion largely leaves alone, which is why keto recipes and nutrition labels treat it as fibre rather than as usable carbohydrate. Different countries label it differently, so read the packet and count it the way your own approach does rather than assuming.

Why does inulin upset my stomach?

Because it reaches your gut bacteria intact and they ferment it, which produces gas. Bloating, wind and cramping after a large dose are extremely common and are the main practical limit on how much you can use. Starting with a small amount and increasing slowly is the usual advice; if it consistently causes you trouble, oat fibre or psyllium is the gentler route for many people.

Can I use inulin to replace all the sugar in a recipe?

Not sensibly. It is only about a third as sweet as sugar, so you would need roughly three times the volume to match sweetness, which is both a lot of fibre to eat and a lot of extra bulk in the batter. Standard practice is to use inulin for part of the bulk and a stronger sweetener such as allulose or monk fruit for the sweetness.

Related substitutes

More sweeteners substitutes

Inulin substitute

Other inulin substitutes

2Plain Sugar or Honey (for feeding yeast)

3Psyllium Husk Powder

4Oat Fibre

5Erythritol Plus a Little Vegetable Glycerine

6Dry Milk Powder or Whey Protein (for body in frozen desserts)