Ingredient review
Chloroacetamide
INCI: CHLOROACETAMIDE
Chloroacetamide is an effective but potentially irritating preservative that has largely been replaced by gentler alternatives in modern cosmetics.
In plain English
Chloroacetamide is a synthetic chemical added to some cosmetic products to stop bacteria, yeast, and mold from growing. It was more common in the past, but today many brands avoid it because it can cause skin irritation or allergic reactions in some people. You'll mostly find it in older formulations or in products from regions with less strict regulations.
Review score
Safety, usefulness, and evidence
Higher-caution ingredient
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Chloroacetamide can be useful, but watch for some irritation potential.
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 Chloroacetamide.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Chloroacetamide is a synthetic organic compound used as a preservative. It belongs to the amide family and works by disrupting the cell walls of microorganisms, preventing them from multiplying in water-based products.
How it works
In a cosmetic product, chloroacetamide dissolves in the water phase and releases small amounts of active molecules that attack the cell membranes of bacteria and fungi. This keeps the product safe from spoilage during its shelf life, especially in products with high water content like shampoos and lotions.
Pros
Broad antimicrobial activity
Chloroacetamide works against a wide range of bacteria, yeast, and mold, making it a reliable preservative at low levels.
Cost-effective preservation
Because it is effective at very low concentrations (often under 0.1%), it can be a budget-friendly option for manufacturers.
Cons and cautions
Skin irritation risk
Chloroacetamide is a known skin sensitizer and can cause redness, itching, or allergic reactions, especially with repeated use.
Outdated in modern skincare
Most reputable brands have replaced chloroacetamide with gentler preservatives like phenoxyethanol, so its presence may indicate an older or less carefully formulated product.
Best for
- People using products with short shelf lives who need strong preservation
- Manufacturers in regions with limited access to newer preservatives
Use caution if
- Anyone with sensitive skin, eczema, or a history of contact allergies
Usage tips
Safety summary
Chloroacetamide is an effective preservative but carries a moderate risk of skin irritation and allergic reactions. It is considered less safe than many modern alternatives and is best avoided by people with sensitive skin.
Research notes
Research shows chloroacetamide can cause allergic contact dermatitis in susceptible individuals. Studies from the 1990s and early 2000s led to its restricted use in many countries. More recent data is limited as it has been largely phased out.
Common label clues
- Typical concentration
- Typically used at 0.1% or less
- Regulatory status
- Chloroacetamide is allowed in cosmetics in many regions but is restricted to low concentrations (typically up to 0.3% in rinse-off products). It is banned in leave-on products in the EU due to allergy risks.
- Common uses
- Shampoos, Soaps, Lotions, Creams
- Environmental note
- Chloroacetamide is synthetic and may persist in water systems after rinsing, though its environmental impact is not well studied.
Good to know
- Chloroacetamide is sometimes listed under alternative names like 'Chloroacetamide' or '2-Chloroacetamide'.
- It is banned or restricted in some countries for leave-on products due to sensitization concerns.
Common questions
What is Chloroacetamide in beauty products?
Chloroacetamide is a synthetic chemical added to some cosmetic products to stop bacteria, yeast, and mold from growing. It was more common in the past, but today many brands avoid it because it can cause skin irritation or allergic reactions in some people. You'll mostly find it in older formulations or in products from regions with less strict regulations.
What does Chloroacetamide do in a beauty product?
In a cosmetic product, chloroacetamide dissolves in the water phase and releases small amounts of active molecules that attack the cell membranes of bacteria and fungi. This keeps the product safe from spoilage during its shelf life, especially in products with high water content like shampoos and lotions.
Is Chloroacetamide safe for most people?
Chloroacetamide is an effective preservative but carries a moderate risk of skin irritation and allergic reactions. It is considered less safe than many modern alternatives and is best avoided by people with sensitive skin.
Who should be careful with Chloroacetamide?
Anyone with sensitive skin, eczema, or a history of contact allergies
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.