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Squalene

Also known as: Squalene oil

An unsaturated skin-surface lipid and cosmetic emollient, distinct from hydrogenated squalane and from evidence of a skin treatment.

Cut-paper olive leaves and olives beside a glass dish of pale oil
Editorial illustration

Squalene is an unsaturated lipid found in human sebum and used in cosmetics as a skin-conditioning ingredient. It differs from squalane, its hydrogenated counterpart. CIR reaffirmed its cosmetic safety conclusion in 2019 for the reported uses; that assessment does not establish an acne or anti-aging treatment benefit.1, 2, 3

  • Squalene and squalane are related but different cosmetic ingredients.1, 2
  • Squalene is a component of human sebum.3
  • A cosmetic safety assessment is not proof of a finished product's efficacy.2

What is Squalene?

Sebum is a mixture of skin-surface lipids, not a ready-made moisturizer formula. Squalene is one component. Its presence in the body helps explain the chemistry, but does not establish that adding more in a product improves a clinical skin outcome.1, 2, 3

Where it comes from

Natural sources

  • Present in human sebum; cosmetic material may have plant- or animal-derived feedstocks

How it's made

Hydrogenating squalene produces squalane. An INCI name does not certify a particular supplier's origin.

What it does in products

  • Skin-conditioning emollient in cosmetic formulations

Benefits

Emollient role in a finished formula

limited evidence

Squalene has a formulation role; standalone acne, wrinkle or disease-treatment claims are not established by these sources.2, 3

CIR evaluates reported cosmetic exposure and safety. The sebum paper is a narrative biology review, not a randomized test of a squalene moisturizer.

Evidence scope and limitations

Topical squalene in cosmetics and its distinction from squalane; not oral supplementation, injectable adjuvants or a comprehensive acne review.

  • The sebum source is a narrative review, not clinical product-efficacy evidence.
  • The use survey does not establish an effective concentration.
  • Oxidation biology cannot assign every finished cosmetic a comedogenicity score.

Evidence last checked: 2026-10-09

Side effects & safety

Formula-dependent irritation or allergy (varies)Cosmetic safety conclusions do not guarantee that a particular product suits every person. A reaction needs assessment of the whole formula.

Safety considerations

  • These sources do not establish compatibility of every squalene formula with prescription skincare.
  • Not for: Avoid a known personal allergen; follow the product's directions and seek assessment for persistent or significant reactions.
2, 4

Amounts studied & product use

These figures describe research or common product use, not a personal dose or treatment recommendation.

In skincare studies and products

The 2019 re-review summarized a reported squalene concentration range of 0.004–1.2% across product categories. It is an exposure survey, not an optimal serum percentage, a legal maximum or a DIY recipe.

2

Regulatory status

  • Cosmetics are FDA-regulated but generally not preapproved. Squalene on an ingredient list is not an FDA-approved treatment claim.
  • INCI name on cosmetic labels: Squalene.
  • CIR's final 2019 re-review reaffirmed the earlier safety conclusion for the reported cosmetic uses and concentrations.
2, 5

Oxidation research is not a universal pore score

The sebum review discusses oxidation products and acne-related biology. This does not measure the acne risk of every cosmetic containing fresh squalene.

Our reading: storage, the complete formulation and product-specific testing matter. Neither natural occurrence in skin nor an oxidation mechanism proves that all squalene products are beneficial or that all clog pores.

3, 2

Frequently asked questions

Are squalene and squalane interchangeable names?

No. They are separately identified ingredients. Check the actual label rather than transferring a claim from one to the other.1, 2

Does a squalene label prove an olive source?

No. The ingredient name does not establish the feedstock of that supply; product-specific sourcing documentation is needed.1

The bottom line

Keep the molecule, supply origin and complete formula separate. Biological plausibility and cosmetic safety are not a treatment trial.

References

  1. Squalene: compound record. NCBI PubChem · ingredient monograph · CID 638072; CAS 111-02-4; identity only; accessed October 9, 2026
  2. Squalane and Squalene: Re-Review Summary. Cosmetic Ingredient Review (2019) · safety assessment · Final 2019 re-review summary
  3. Picardo M, Ottaviani M, Camera E, Mastrofrancesco A. Sebaceous gland lipids. Dermato-Endocrinology (2009) · other · PMID 20224686; DOI 10.4161/derm.1.2.8472; narrative review
  4. Allergens in Cosmetics. U.S. Food and Drug Administration · government guidance · Undated resource; accessed October 9, 2026
  5. FDA Authority Over Cosmetics: How Cosmetics Are Not FDA-Approved, but Are FDA-Regulated. U.S. Food and Drug Administration (2013) · government guidance

Revision history

  1. Initial AI-assisted source checks and claim-level citation mapping under the site-authorized publishing workflow. No separate human or independent medical review is claimed.