Ingredient review

Ammonium Myristyl Sulfate

INCI: Ammonium Myristyl Sulfate

A common foaming cleanser ingredient that is generally milder than sodium lauryl sulfate but can still be drying for sensitive skin.

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In plain English

Ammonium myristyl sulfate is a cleansing agent that helps water mix with oil and dirt so they can be rinsed away. It creates a rich lather and is often used in shampoos and face washes. While it is considered gentler than some other sulfates, it can still strip natural oils from the skin, especially with frequent use.

Quick decision guide

Useful, but context matters

Ammonium Myristyl 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Ammonium Myristyl Sulfate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic anionic surfactant derived from myristyl alcohol (a fatty alcohol) and sulfuric acid, neutralized with ammonia. It belongs to the alkyl sulfate family.

How it works

It reduces the surface tension between water and oil, allowing the product to lift sebum, makeup, and debris from the skin. During rinsing, the suspended impurities are washed away.

Pros

Effective cleanser

Removes surface oils and impurities well, leaving skin feeling clean and refreshed.

Milder than some sulfates

Compared to sodium lauryl sulfate, it is less likely to cause immediate irritation, making it a better choice for daily use.

Cons and cautions

Potential for dryness

With frequent use, it can strip the skin's natural oils, leading to tightness or flakiness, especially in dry climates.

Not sulfate-free

If you prefer to avoid sulfates entirely for environmental or sensitivity reasons, this ingredient does not qualify.

Best for

  • People with normal to oily skin who enjoy a foamy cleanser
  • Those looking for an effective but not ultra-harsh sulfate option

Use caution if

  • Individuals with very dry, sensitive, or compromised skin barriers
  • Those following a sulfate-free routine for scalp or skin conditions

Usage tips

Use a moisturizer after cleansing to replenish any lost hydration.
Limit use to once daily if you have combination or slightly dry skin.
Avoid scrubbing vigorously; let the cleanser do the work.

Safety summary

Generally recognized as safe for use in rinse-off cosmetics at typical concentrations. Mild to moderate irritation potential exists, especially for sensitive skin. Not linked to serious health concerns when used as directed.

Research notes

Studies show that alkyl sulfates can disrupt the skin barrier with repeated exposure, but ammonium myristyl sulfate is less aggressive than SLS. Most safety data comes from industry assessments and regulatory reviews.

Common label clues

Typical concentration
1–15% in rinse-off products
Regulatory status
Approved for use in cosmetics by the FDA and the European Commission. Concentrations are typically limited to 15% in rinse-off products.
Common uses
Facial cleansers, Body washes, Shampoos, Shower gels
Environmental note
As a synthetic surfactant, it may not be readily biodegradable. Some consumers prefer plant-based alternatives for lower environmental impact.

Good to know

  • Ammonium myristyl sulfate is often found in 'gentle' or 'daily' cleansers, but it is still a sulfate.
  • It is not the same as sodium lauryl sulfate (SLS) — it is generally considered milder.

Common questions

What is Ammonium Myristyl Sulfate in beauty products?

Ammonium myristyl sulfate is a cleansing agent that helps water mix with oil and dirt so they can be rinsed away. It creates a rich lather and is often used in shampoos and face washes. While it is considered gentler than some other sulfates, it can still strip natural oils from the skin, especially with frequent use.

What does Ammonium Myristyl Sulfate do in a beauty product?

It reduces the surface tension between water and oil, allowing the product to lift sebum, makeup, and debris from the skin. During rinsing, the suspended impurities are washed away.

Is Ammonium Myristyl Sulfate safe for most people?

Generally recognized as safe for use in rinse-off cosmetics at typical concentrations. Mild to moderate irritation potential exists, especially for sensitive skin. Not linked to serious health concerns when used as directed.

Who should be careful with Ammonium Myristyl Sulfate?

Individuals with very dry, sensitive, or compromised skin barriers Those following a sulfate-free routine for scalp or skin conditions

Research sources

Cosmetic Ingredient Review (CIR) – Safety Assessment of Alkyl SulfatesOpenEuropean Commission CosIng DatabaseOpenPubMed – Surfactant effects on skin barrierOpen

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.