Ingredient review

Myristoyl Lactylic Acid

INCI: Myristoyl Lactylic Acid

A mild, skin-friendly cleansing agent that helps remove dirt and oil without stripping the skin's natural moisture barrier.

beautyskincaresurfactant

In plain English

Myristoyl lactylic acid is a gentle cleansing ingredient made from myristic acid (a fatty acid found in coconut oil) and lactic acid (an alpha hydroxy acid). It helps water and oil mix together so that cleansers can effectively remove dirt, makeup, and excess oil from your skin. Unlike harsher detergents, it is designed to clean without leaving your skin feeling tight or dry, making it a good choice for sensitive or dry skin types.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

Potentially useful with some tradeoffs

The evidence base is useful, but some claims depend heavily on the formula.

Risk flags are low for most users, though the finished product can still irritate.

Source
semi synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Myristoyl Lactylic Acid 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Myristoyl Lactylic Acid.
  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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

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

Myristoyl lactylic acid is a semi-synthetic surfactant and emulsifier. It is created by combining myristic acid (a saturated fatty acid from plant sources like coconut or palm oil) with lactic acid (a natural alpha hydroxy acid). The result is a mild, anionic surfactant that helps cleanse and condition the skin.

How it works

In a cosmetic product, myristoyl lactylic acid works by reducing the surface tension between water and oil, allowing them to blend. This helps lift dirt, sebum, and makeup from the skin so they can be rinsed away. It also has some conditioning properties, which means it can leave the skin feeling soft and smooth after washing.

Pros

Mild on skin

Myristoyl lactylic acid is much gentler than traditional sulfates like sodium lauryl sulfate, making it suitable for daily use on sensitive or dry skin without causing tightness or irritation.

Conditioning effect

Unlike many harsh cleansers that can leave skin feeling dry, this ingredient has mild conditioning properties that help maintain a soft, smooth feel after washing.

Cons and cautions

Potential for mild irritation

While generally very gentle, some individuals with extremely reactive skin may experience slight irritation if the ingredient is used at high concentrations in leave-on products.

Semi-synthetic origin

Although derived from natural fatty acids, the chemical processing involved means it is not considered a fully natural ingredient, which may be a concern for some consumers.

Best for

  • People with dry or sensitive skin looking for a gentle cleanser
  • Anyone who prefers mild, non-stripping cleansing ingredients

Use caution if

  • Individuals with known allergies to coconut-derived fatty acids (rare)

Usage tips

Look for myristoyl lactylic acid in the ingredient list of your favorite gentle cleanser or facial wash.
Pair with a moisturizer after cleansing to lock in hydration, especially if you have dry skin.

Safety summary

Myristoyl lactylic acid is considered safe for use in cosmetics. It has low irritation and comedogenic potential, making it suitable for most skin types, including sensitive and dry skin. As with any ingredient, patch testing is recommended for those with known sensitivities.

Research notes

Research on myristoyl lactylic acid specifically is limited, but it belongs to a class of acyl lactylates that have been studied for their mildness and skin compatibility. These ingredients are generally recognized as safe and effective for cleansing and emulsifying in cosmetic formulations.

Common label clues

Typical concentration
1% to 5% in rinse-off products; lower in leave-on formulations
Regulatory status
Approved for use in cosmetics in the EU, US, and other major markets. The Cosmetic Ingredient Review (CIR) panel has evaluated similar fatty acid lactylates and found them safe for use in rinse-off and leave-on products at typical concentrations.
Common uses
Cleansers, Facial washes, Body washes, Shampoos, Conditioners
Environmental note
Myristoyl lactylic acid is derived from plant-based fatty acids and is considered biodegradable, though its production involves chemical synthesis. It is not known to be a significant environmental concern at typical cosmetic usage levels.

Good to know

  • This ingredient is often used in combination with other mild surfactants to create a balanced cleansing formula.
  • It is considered biodegradable and generally safe for the environment at typical usage levels.

Common questions

What is Myristoyl Lactylic Acid in beauty products?

Myristoyl lactylic acid is a gentle cleansing ingredient made from myristic acid (a fatty acid found in coconut oil) and lactic acid (an alpha hydroxy acid). It helps water and oil mix together so that cleansers can effectively remove dirt, makeup, and excess oil from your skin. Unlike harsher detergents, it is designed to clean without leaving your skin feeling tight or dry, making it a good choice for sensitive or dry skin types.

What does Myristoyl Lactylic Acid do in a beauty product?

In a cosmetic product, myristoyl lactylic acid works by reducing the surface tension between water and oil, allowing them to blend. This helps lift dirt, sebum, and makeup from the skin so they can be rinsed away. It also has some conditioning properties, which means it can leave the skin feeling soft and smooth after washing.

Is Myristoyl Lactylic Acid safe for most people?

Myristoyl lactylic acid is considered safe for use in cosmetics. It has low irritation and comedogenic potential, making it suitable for most skin types, including sensitive and dry skin. As with any ingredient, patch testing is recommended for those with known sensitivities.

Who should be careful with Myristoyl Lactylic Acid?

Individuals with known allergies to coconut-derived fatty acids (rare)

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Acyl LactylatesOpenPubChem - Myristoyl Lactylic AcidOpenEuropean Chemicals Agency (ECHA) - Myristoyl Lactylic AcidOpen

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.