Ingredient review
Sodium Dehydroacetate
INCI: Sodium Dehydroacetate
A widely used, low-irritation preservative that helps keep your products fresh and safe from microbes.
In plain English
Sodium dehydroacetate is a preservative added to cosmetics to stop bacteria, yeast, and mold from growing. It's a salt form of dehydroacetic acid and works best in slightly acidic formulas. You'll find it in many creams, lotions, sunscreens, and makeup. It's considered very gentle on skin and is one of the milder preservatives available.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is relatively strong for its common cosmetic role.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- strong
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Sodium Dehydroacetate is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Sodium Dehydroacetate.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
strongThere is a stronger practical or research basis for the ingredient role described here.
What it is
Sodium dehydroacetate is the sodium salt of dehydroacetic acid, a synthetic compound with antimicrobial properties. It is a white, odorless powder that dissolves easily in water and is commonly used as a preservative in cosmetics and personal care products.
How it works
It works by interfering with the cell membranes and metabolic processes of microorganisms like bacteria, yeast, and fungi, preventing them from growing and spoiling the product. This extends the shelf life and keeps the product safe to use.
Pros
Gentle on skin
Sodium dehydroacetate has a very low irritation and sensitization rate, making it suitable for sensitive skin and baby products.
Broad antimicrobial protection
It effectively inhibits bacteria, yeast, and mold, helping your products stay fresh and safe for longer.
Cons and cautions
pH dependent
It works best in slightly acidic formulas (pH 3-6). In neutral or alkaline products, its preservative power drops significantly, so it's not a one-size-fits-all solution.
Synthetic origin
It is made in a lab, which may be a drawback for consumers who prefer naturally derived or 'clean' preservatives.
Best for
- Anyone using water-based cosmetics that need preservation
- People with sensitive skin who react to stronger preservatives
Use caution if
- Those seeking 100% preservative-free or 'natural' products
- People with known rare allergy to dehydroacetic acid or its salts
Usage tips
Safety summary
Sodium dehydroacetate is considered safe for use in cosmetics at regulated concentrations. It has low acute toxicity, is not a skin sensitizer, and is not known to be carcinogenic or mutagenic. Rare allergic reactions have been reported but are uncommon.
Research notes
Multiple safety assessments by the Cosmetic Ingredient Review (CIR) Expert Panel and the European Scientific Committee on Consumer Safety (SCCS) have concluded that sodium dehydroacetate is safe for use in cosmetics at concentrations up to 0.6% in leave-on products and 1% in rinse-off products.
Common label clues
- Typical concentration
- Up to 0.6% in leave-on products, up to 1% in rinse-off products
- Regulatory status
- Approved for use in cosmetics globally, with concentration limits varying by region (e.g., up to 0.6% in leave-on products in the EU and US).
- Common uses
- Moisturizers, Sunscreens, Makeup, Cleansers, Hair care
- Environmental note
- Sodium dehydroacetate is biodegradable and does not bioaccumulate, but its production is synthetic and relies on chemical manufacturing processes.
Good to know
- Sodium dehydroacetate is approved for use in cosmetics by the FDA, EU, and Japan, with maximum concentration limits typically around 0.6%.
- It is sometimes listed on labels as 'Sodium Dehydroacetate' or simply 'Dehydroacetic Acid' (its acid form).
Common questions
What is Sodium Dehydroacetate in beauty products?
Sodium dehydroacetate is a preservative added to cosmetics to stop bacteria, yeast, and mold from growing. It's a salt form of dehydroacetic acid and works best in slightly acidic formulas. You'll find it in many creams, lotions, sunscreens, and makeup. It's considered very gentle on skin and is one of the milder preservatives available.
What does Sodium Dehydroacetate do in a beauty product?
It works by interfering with the cell membranes and metabolic processes of microorganisms like bacteria, yeast, and fungi, preventing them from growing and spoiling the product. This extends the shelf life and keeps the product safe to use.
Is Sodium Dehydroacetate safe for most people?
Sodium dehydroacetate is considered safe for use in cosmetics at regulated concentrations. It has low acute toxicity, is not a skin sensitizer, and is not known to be carcinogenic or mutagenic. Rare allergic reactions have been reported but are uncommon.
Who should be careful with Sodium Dehydroacetate?
Those seeking 100% preservative-free or 'natural' products People with known rare allergy to dehydroacetic acid or its salts
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.