Does inulin help with eczema or psoriasis? What the research does and doesn't show

No published human trial has measured what inulin does to eczema or psoriasis symptoms themselves. The one randomized trial in a skin-disease population — adults with psoriasis — tested inulin-type fructans for metabolic markers like blood sugar and body composition, not for skin severity, and found no significant within-group change on those metabolic measures either.

What the evidence doesn't support

It doesn't support inulin as something that changes eczema, psoriasis or any other skin condition's severity in people — no trial has measured that outcome directly. What animal research does show, in a mouse model of eczema-like skin inflammation, doesn't translate automatically to a claim about human skin.

What the trials found

A 2026 randomized, double-blind, placebo-controlled trial (the INGUTSKIN study) gave 29 adults with mild psoriasis 15 g/day of chicory-derived inulin-type fructans, and 27 a placebo, for 8 weeks, with 32 healthy adults as a baseline reference group. The trial measured body composition, resting energy expenditure and carbohydrate metabolism — not skin symptoms or psoriasis severity. People with psoriasis started with higher BMI, visceral fat and abnormal glucose markers than the healthy comparison group. Over 8 weeks, fasting glucose stayed steady in the inulin group while it moved upward in the placebo group, and resting metabolic rate stayed steady in the inulin group while it fell in the placebo group; body composition itself didn't differ significantly between groups. The authors themselves cautioned that these findings should be read carefully, since they reflect deterioration in the placebo arm as much as any change in the inulin arm. Nothing in this trial speaks to skin lesions, itch or disease severity.

Separately, a 2023 mouse study tested inulin and beta-glucan in an oxazolone-induced model of eczema-like skin inflammation (atopic dermatitis). In that model, both prebiotics reduced skin-lesion severity and inflammatory markers when given after sensitization, and when given beforehand, delayed and reduced the disease's onset. That's a controlled animal model using an induced condition, not a trial in people with eczema, and it hasn't been followed by a published human trial that we could find.

The gap between the mouse data and the psoriasis trial is worth being specific about: the mouse study measured the thing people actually ask about — lesion severity, inflammation, epidermal thickness — and found a reduction; the human trial measured something else entirely — glucose, insulin, resting metabolic rate — in a different skin condition, and found stability rather than deterioration on some of those metabolic markers. Neither one answers "does inulin help my skin," because neither one tested that question in a person.

Questions people ask

Inulin eczema

No human trial has tested inulin in people with eczema. What exists is a 2023 mouse study, where inulin reduced skin-lesion severity in an induced model of eczema-like inflammation — a result from animals, not a finding shown in people yet.

When to talk to a doctor

Eczema, psoriasis and other diagnosed skin conditions should be managed with a dermatologist or doctor. Inulin is not a treatment for any skin condition, and the human trial evidence above measured metabolic markers in people with psoriasis, not skin symptoms. Anyone with a diagnosed skin condition, or on a prescription treatment for one, should talk to a doctor before adding a fiber supplement.

Related reading: inulin side effects, inulin benefits, inulin dosage, and who should not take inulin.