Inulin for Hair: What the Research Shows

Inulin is a prebiotic fiber found in foods like chicory root, onion and garlic. It's well studied for gut bacteria and mineral absorption, and we found no study of inulin on hair growth, the scalp or hair thickness.

Here's what inulin does in the body, where to get it, and why the hair claims you may see are unproven.

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Key Takeaways

• Inulin is a soluble fiber found in more than 36,000 plant species, with Jerusalem artichoke and chicory root the main commercial sources.
• It's a prebiotic: it feeds beneficial gut bacteria. In human trials, inulin-type fructans also increased calcium and magnesium absorption.
• In a trial of adolescents, 8 g a day of inulin-type fructans increased calcium absorption and bone mineral gain.
• We found no study of inulin for hair growth or hair thickness.

What Is Inulin?

Inulin is a soluble dietary fiber stored by plants as a reserve carbohydrate. It's used in the food industry and sold as a supplement.

Does Inulin Do Anything For Hair?

The claims you see online that inulin "nourishes the scalp" or "stimulates follicles" aren't backed by studies we could find. Any hair benefit would be indirect, through gut or mineral effects, and no research has connected those to hair.

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Getting Inulin

Inulin comes from plant foods and from supplements. Adding fiber gradually is the usual approach, and your doctor can advise you if you have a digestive condition. A varied diet with vegetables, onions and garlic is a good base for overall health, including your hair.

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What The Research Shows

Sources And Roles

Inulin is found in more than 36,000 plant species. The main raw materials for industry are Jerusalem artichoke and chicory root, and it's also in onion, garlic and barley. As a prebiotic it supports beneficial gut bacteria, and reviewed benefits include lipid metabolism, blood sugar, mineral absorption and constipation (Qin et al., 2023).

What Human Trials Show

A systematic review of human trials in healthy adults found inulin-type fructans promote Bifidobacterium, Lactobacillus and Faecalibacterium prausnitzii, and reported better laxation, improved lipid profile and increased absorption of calcium and magnesium. It noted that evidence on chain length is limited (Hughes et al., 2022).

Calcium Absorption In Adolescents

In a randomized trial, pubertal adolescents took 8 g a day of an inulin-type fructan or a placebo. Calcium absorption was significantly higher in the fructan group at 8 weeks (8.5 percentage points) and at 1 year (5.9), and bone mineral content and density gained more (Abrams et al., 2005).

See also: Flaxseed and Lignans for Hair: What the Research Shows · Chromium for Hair: Blood Sugar, Insulin & What the Research Shows

Prebiotic fiber is one of the ingredients in FullyVital's Hair Revival Supplements and Hair Skin Gut Collagen. For how the evidence for each ingredient in the line stacks up, see our evidence-tier breakdown.

Frequently Asked Questions

Does inulin help hair growth?

We found no study showing it does. The claims are not backed by research.

Is inulin safe?

It's a common dietary fiber. Talk to your doctor before taking it as a supplement if you're pregnant, breastfeeding, have a digestive condition or take medication.

What foods contain inulin?

Chicory root, Jerusalem artichoke, onion, garlic and barley.

References

1. Qin YQ, Wang LY, Yang XY, et al. Inulin: properties and health benefits. Food Funct. 2023. PubMed
2. Hughes RL, Alvarado DA, Swanson KS, et al. The Prebiotic Potential of Inulin-Type Fructans: A Systematic Review. Adv Nutr. 2022. PubMed
3. Abrams SA, Griffin IJ, Hawthorne KM, et al. A combination of prebiotic short- and long-chain inulin-type fructans enhances calcium absorption and bone mineralization in young adolescents. Am J Clin Nutr. 2005. PubMed