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Dehydroacetic Acid

A cosmetic preservative often discussed alongside its sodium salt; it is not vinegar's acetic acid.

Charcoal drawing of a glass vial and ceramic powder tray
Editorial illustration

Dehydroacetic acid is a preservative used in cosmetics, distinct from vinegar's acetic acid and from sodium dehydroacetate. CIR's 2024 re-review reaffirmed its earlier conclusion for the reported practices of cosmetic use. That is a conditional assessment of exposure, not proof that every formula is adequately preserved or nonirritating.1

  • A cosmetic preservative, not dietary vinegar.1
  • Dehydroacetic acid and sodium dehydroacetate were re-reviewed together.1
  • The 2024 publication reaffirmed the earlier reported-use conclusion.1

What is Dehydroacetic Acid?

The acid and its sodium salt are often assessed together, but they remain different label identities. In practice, a preservation system must work within the full formula. Ingredients, acidity, packaging and testing matter more than a preservative's reputation as gentle or natural-friendly.1

Where it comes from

Natural sources

  • Not a vinegar extract or an essential dietary acid.

How it's made

Manufactured preservative; sodium dehydroacetate is its separately named salt.

What it does in products

  • Cosmetic preservation

Benefits

Protecting the product's quality

limited evidence

The preservative role is to support microbial control in a formula, not to provide an independent skin treatment.1, 2

CIR's re-review and a preservative risk-characterization paper address safety, exposure and hazard. They do not validate the preservation performance of an unidentified commercial cream.

Evidence scope and limitations

Dehydroacetic acid in cosmetic preservation and the 2024 CIR re-review; excludes food-acid and vinegar claims.

  • The assessment is tied to reported cosmetic exposure.
  • No whole-product microbial performance or optimal use level is inferred.

Evidence last checked: 2026-10-01

Side effects & safety

Irritation or an individual reaction (varies)Acceptability under reported use conditions does not ensure every user tolerates every product.

Safety considerations

  • The acid, its sodium salt and a blend with other preservatives should not be treated as one identical exposure.
  • Not for: Avoid a product after a confirmed reaction; raw preservative handling is not cosmetic use.
1, 2

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 re-review considered updated use-frequency and concentration information. This guide does not turn reported industry levels into a universal DIY recipe, personal dose or regulatory ceiling.

1

Regulatory status

  • A U.S. cosmetic preservative subject to product-safety requirements; not an FDA-approved skin-treatment active.
  • INCI name on cosmetic labels: Dehydroacetic Acid.
  • 2024 re-review reaffirmed the prior conclusion for the practices of use and concentration assessed.
1, 3

A re-review is more precise than a fresh approval

The 2024 paper explains that updated use information and relevant safety data were considered and the prior conclusion was reaffirmed. Describing it as a newly FDA-approved ingredient would misstate both the process and the institution.

The review also does not make a formula's other ingredients irrelevant. A preservative system needs product-level evaluation rather than a guarantee borrowed from one ingredient's assessment.

1, 2

Frequently asked questions

Is dehydroacetic acid the same as acetic acid?

No. The preservative is a distinct compound; vinegar and vinegar-related nutrition claims do not describe it.1

Does a CIR review prove a cream will not grow microbes?

No. A safety assessment of ingredient exposure is different from testing a complete formula's preservative effectiveness.1, 2

The bottom line

The 2024 re-review is useful safety context, not a product-performance certificate or a reason to infer vinegar-like effects.

References

  1. Sodium Dehydroacetate and Dehydroacetic Acid. International Journal of Toxicology / Cosmetic Ingredient Review (2024) · safety assessment · DOI 10.1177/10915818241260276
  2. Canavez ADPM, de Oliveira Prado Corrêa G, Isaac VLB et al.. Integrated approaches to testing and assessment as a tool for the hazard assessment and risk characterization of cosmetic preservatives. Journal of Applied Toxicology (2021) · safety assessment · PMID 33624850; DOI 10.1002/jat.4156
  3. FDA Authority Over Cosmetics: How Cosmetics Are Not FDA-Approved, but Are FDA-Regulated. U.S. Food and Drug Administration (2013) · government guidance · Page updated August 3, 2013; accessed October 1, 2026

Revision history

  1. Initial AI-assisted evidence compilation with source-linked claims, formulation distinctions and explicit research limitations; not independent medical review.