Ingredient review
Sodium C12-13 Alkyl Sulfate
INCI: SODIUM C12-13 ALKYL SULFATE
A strong, effective cleanser that can be drying or irritating for sensitive skin, but is generally safe in rinse-off formulas.
In plain English
Sodium C12-13 Alkyl Sulfate is a detergent-like ingredient that helps water mix with oil and dirt so they can be rinsed away. It creates a rich lather in shampoos and body washes. Because it can strip natural oils from the skin, it may feel drying or tight for some people, especially those with sensitive or dry skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
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
Useful, but context matters
Sodium C12-13 Alkyl Sulfate 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 Sodium C12-13 Alkyl Sulfate.
- 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
A synthetic surfactant made from petroleum or plant-derived fatty alcohols. It belongs to the alkyl sulfate family, similar to sodium lauryl sulfate (SLS) but with a slightly different carbon chain length (C12-13).
How it works
It reduces the surface tension of water, allowing it to penetrate oils and dirt on the skin or hair. This action lifts impurities so they can be washed away. Its foaming ability makes it popular in cleansers.
Pros
Strong cleanser
Effectively removes excess oil, sweat, and dirt, making it great for oily skin types.
Good lather
Produces a rich foam that many people associate with a satisfying cleansing experience.
Cons and cautions
Can be drying
May strip the skin of its natural moisture barrier, leading to tightness or flakiness after washing.
Irritation potential
For sensitive skin, it can cause redness, stinging, or irritation, especially with frequent use.
Best for
- People with oily or normal skin who want a deep clean
- Those who enjoy a foamy lather in their cleansers
Use caution if
- Individuals with dry, sensitive, or compromised skin barriers
- Those with eczema or rosacea
Usage tips
Safety summary
Sodium C12-13 Alkyl Sulfate is considered safe for use in rinse-off cosmetics at typical concentrations. However, it can be drying and irritating for some skin types, especially with prolonged or frequent use. The Cosmetic Ingredient Review (CIR) panel has reviewed similar alkyl sulfates and found them safe when formulated to be non-irritating.
Research notes
Studies on alkyl sulfates show they can disrupt the skin barrier and increase water loss (TEWL) at high concentrations. However, in properly formulated rinse-off products, irritation is generally mild. The CIR panel has concluded that alkyl sulfates are safe for cosmetic use when formulated to avoid significant irritation.
Common label clues
- Typical concentration
- 1% to 15% in rinse-off products
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with concentration limits in some leave-on products.
- Common uses
- Shampoos, Body washes, Facial cleansers, Hand soaps
- Environmental note
- Alkyl sulfates are generally biodegradable, but their production from petroleum can have a higher carbon footprint compared to plant-derived alternatives.
Good to know
- Sodium C12-13 Alkyl Sulfate is often used as a lower-irritation alternative to Sodium Lauryl Sulfate (SLS), but it is still a strong surfactant.
- It is commonly found in rinse-off products, not leave-on formulas, to reduce prolonged skin contact.
Common questions
What is Sodium C12-13 Alkyl Sulfate in beauty products?
Sodium C12-13 Alkyl Sulfate is a detergent-like ingredient that helps water mix with oil and dirt so they can be rinsed away. It creates a rich lather in shampoos and body washes. Because it can strip natural oils from the skin, it may feel drying or tight for some people, especially those with sensitive or dry skin.
What does Sodium C12-13 Alkyl Sulfate do in a beauty product?
It reduces the surface tension of water, allowing it to penetrate oils and dirt on the skin or hair. This action lifts impurities so they can be washed away. Its foaming ability makes it popular in cleansers.
Is Sodium C12-13 Alkyl Sulfate safe for most people?
Sodium C12-13 Alkyl Sulfate is considered safe for use in rinse-off cosmetics at typical concentrations. However, it can be drying and irritating for some skin types, especially with prolonged or frequent use. The Cosmetic Ingredient Review (CIR) panel has reviewed similar alkyl sulfates and found them safe when formulated to be non-irritating.
Who should be careful with Sodium C12-13 Alkyl Sulfate?
Individuals with dry, sensitive, or compromised skin barriers Those with eczema or rosacea
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.