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Surfactants & Emulsifiers

Polysorbate 20

Also known as: Tween 20, PEG sorbitan monolaurate, E432

The gentler, water-loving polysorbate — a mild cleanser and solubilizer with less gut controversy than its big sibling.

  • By IngredientWiki Editorial Team
  • Fact-checked by IngredientWiki Editorial Team
  • Updated 2026-09-26
  • 2 min read

In short

Polysorbate 20 is the water-soluble sibling of polysorbate 80 — a nonionic surfactant made from sorbitol, ethylene oxide, and lauric acid. It shares the family function: making oil and water mix, and making foam and cleansing mild. But its shorter lauric tail gives it a distinct role in cosmetics — it is a key solubilizer of fragrance oils and a primary gentle cleanser in micellar waters and mild shampoos, and it appears in foods (E432) and pharmaceuticals. It is generally well tolerated, with the same theoretical caveats as other ethoxylated surfactants (trace 1,4-dioxane in poorly purified grades) and far less of the gut-research attention aimed at polysorbate 80.

  • Nonionic surfactant; sorbitol + ethylene oxide + lauric acid
  • Fragrance solubilizer and mild cleanser in cosmetics
  • Food code E432; pharmaceutical uses
  • Well tolerated; purification matters (1,4-dioxane trace concern)

What is Polysorbate 20?

Polysorbate 20 is the understudy that handles the delicate roles. Where polysorbate 80 gets the headline jobs — vaccines, ice cream, gut-research controversies — its shorter-chained sibling quietly does the fine work of cosmetics: dissolving fragrance oils into watery toners, softening cleansers, and holding micellar waters together. The chemistry is shared, the personality is lighter. For ingredient-watchers, the practical differences are more useful than the family resemblance.

Where it comes from

Natural sources

  • Derived from natural feedstocks (sorbitol from starch, lauric acid from coconut/palm)
  • Ethylene-oxide polymerization makes the final molecule synthetic

How it's made

Pale viscous liquid; used at 0.5–10% in cosmetics, food code E432.

What it does in products

  • Oil and fragrance solubilization in water
  • Mild cleansing (micelle formation)
  • Foam boosting in gentle shampoos
  • Emulsion stabilization

Benefits

Gentle cleansing

strong evidence

Powers micellar waters and mild cleansers without stripping — a standard choice in sensitive-skin and eye-area products.

Fragrance solubilization

strong evidence

Allows oil-based fragrance blends to dissolve clear in water-based toners and mists — an invisible but essential formulation function.

Good tolerability record

strong evidence

Low irritation at cosmetic concentrations; sensitization uncommon in patch-test data.

Side effects & safety

Mild irritation at high concentrations (uncommon)Rare at typical 0.5–5% cosmetic levels.
Sensitization (rare)More associated with impurities than the molecule itself.

Safety considerations

  • Considered safe in cosmetics and food at regulated levels.
  • None significant.
  • Not for: Known hypersensitivity (rare)

How it's used

In supplements

Present incidentally in foods and supplements; not taken intentionally.

In skincare

0.5–5% as solubilizer; up to 10% in rinse-off cleansers.

Regulatory status

  • Approved food additive (E432) and permitted cosmetic ingredient.
  • GRAS (generally recognized as safe) for food use.
  • INCI name on cosmetic labels: Polysorbate 20.
  • CIR-reviewed and found safe as used, with purification guidance.

Popular products containing Polysorbate 20

  • Garnier Micellar Cleansing Water — Polysorbate-anchored micellar systemGarnier · Skincare
  • Bioderma Sensibio H2O — Polysorbate 20 in the micellar baseBioderma · Skincare
  • Thayers Witch Hazel Toner (some variants) — Fragrance solubilization roleThayers · Skincare

Product names and brands are shown for reference and belong to their respective owners.

Polysorbate 20 vs 80

The number is the fatty tail: 20 uses lauric acid (C12), 80 uses oleic acid (C18). The shorter tail makes polysorbate 20 more water-loving — better at dissolving light oils and fragrances into water, milder on skin — while polysorbate 80 handles heavier emulsions and pharmaceutical uses. The gut-permeability research targeted the 80 variant specifically, not the family.

The 1,4-dioxane note

Ethoxylated surfactants can carry trace 1,4-dioxane, a byproduct of manufacture, if not stripped by vacuum purification. Reputable suppliers purify below detection limits, and finished products from major brands test routinely — a supply-chain quality matter, not an ingredient-level risk.

Frequently asked questions

Is polysorbate 20 as controversial as polysorbate 80?

No — the gut-barrier studies used polysorbate 80 at extreme doses. Polysorbate 20 has not been implicated in that research, and its cosmetic concentrations are low.

Why is polysorbate 20 in my toner?

It keeps fragrance and light oils dissolved so the formula stays clear and uniform — without it, toners would separate or cloud.

Does polysorbate 20 strip skin?

No — it is selected precisely because it cleanses gently, which is why it anchors micellar waters marketed for sensitive skin.

The bottom line

Polysorbate 20 is a mild, well-regulated cosmetic surfactant whose quiet jobs — solubilizing fragrance, softening cleansers — keep modern skincare stable and comfortable.

References

  1. Polysorbate 20 — Cosmetic Ingredient Review. CIR. https://www.cir-safety.org/ingredients
  2. Polysorbates: properties and applications. PubMed Central. https://pubmed.ncbi.nlm.nih.gov/34422023/
  3. 1,4-Dioxane in cosmetics — FDA. U.S. Food and Drug Administration. https://www.fda.gov/cosmetics/cosmetic-ingredients/14-dioxane-cosmetics