Ingredient review

Isotridecyl Myristate

INCI: Isotridecyl Myristate

A lightweight synthetic emollient that softens skin but may clog pores for some people.

beautyskincareemollient

In plain English

Isotridecyl myristate is a man-made oil-like ingredient that spreads easily on the skin, making it feel smooth and soft without being greasy. It's often used in moisturizers and makeup to improve texture and help other ingredients glide on. However, because it can block pores, it's not the best choice for acne-prone skin.

Review score

Safety, usefulness, and evidence

3.8Good
3.8/ 5

Potentially useful with some tradeoffs

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

Main practical flags: irritation is low; clogging risk is moderate.

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

Quick decision guide

Useful, but context matters

Isotridecyl Myristate can be useful, but watch for possible clogging concerns.

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 Isotridecyl Myristate.
  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

moderate

May be fine for many users but deserves caution if you are breakout-prone.

Evidence level

moderate

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

What it is

A synthetic ester created by combining isotridecyl alcohol with myristic acid, designed to mimic natural skin oils.

How it works

It sits on the skin's surface, filling in rough spots and reducing water loss by forming a light, non-occlusive film. This improves the feel of products and helps them spread evenly.

Pros

Lightweight feel

It provides a smooth, silky texture without the heavy, greasy sensation of some oils, making it pleasant in daily moisturizers and makeup.

Improves product performance

Helps other ingredients spread evenly and enhances the overall sensory experience of creams, lotions, and foundations.

Cons and cautions

Moderate comedogenic risk

Rated as moderately likely to clog pores, which can lead to breakouts for those with acne-prone or oily skin.

Synthetic origin

As a lab-created ingredient, it may not appeal to consumers seeking natural or plant-based formulations.

Best for

  • People with normal to dry skin looking for a lightweight emollient
  • Those who enjoy smooth, silky makeup textures

Use caution if

  • Individuals with very oily or acne-prone skin who are sensitive to pore-clogging ingredients

Usage tips

Check product labels if you have acne-prone skin and avoid formulas where isotridecyl myristate appears high on the ingredient list.
Pair with non-comedogenic moisturizers if you want to use products containing this ingredient without risking clogged pores.

Safety summary

Isotridecyl myristate is generally safe for most skin types when used as directed. The main concern is its moderate comedogenic potential, which can cause breakouts in susceptible individuals. No significant toxicity or irritation has been reported in cosmetic use.

Research notes

Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that isotridecyl myristate is safe for use in cosmetics. Studies indicate low acute toxicity and minimal skin irritation, but comedogenicity ratings vary by formulation and individual skin type.

Common label clues

Typical concentration
1–10% in leave-on products
Regulatory status
Approved for use in cosmetics in the US (FDA) and EU (CosIng) with no concentration restrictions, though formulators typically keep it under 10%.
Common uses
Moisturizers, Foundations, Lipsticks, Sunscreens
Environmental note
As a synthetic ester, it is not biodegradable and may accumulate in aquatic environments, though its environmental impact is considered low at typical usage levels.

Good to know

  • Isotridecyl myristate is often used in lip products because it provides a smooth, non-sticky feel.
  • It is considered safe for use in cosmetics by major regulatory bodies at typical concentrations.

Common questions

What is Isotridecyl Myristate in beauty products?

Isotridecyl myristate is a man-made oil-like ingredient that spreads easily on the skin, making it feel smooth and soft without being greasy. It's often used in moisturizers and makeup to improve texture and help other ingredients glide on. However, because it can block pores, it's not the best choice for acne-prone skin.

What does Isotridecyl Myristate do in a beauty product?

It sits on the skin's surface, filling in rough spots and reducing water loss by forming a light, non-occlusive film. This improves the feel of products and helps them spread evenly.

Is Isotridecyl Myristate safe for most people?

Isotridecyl myristate is generally safe for most skin types when used as directed. The main concern is its moderate comedogenic potential, which can cause breakouts in susceptible individuals. No significant toxicity or irritation has been reported in cosmetic use.

Who should be careful with Isotridecyl Myristate?

Individuals with very oily or acne-prone skin who are sensitive to pore-clogging ingredients

Research sources

Cosmetic Ingredient Review (CIR) Safety AssessmentOpenCosIng - European Commission DatabaseOpenPubMed - Comedogenicity of cosmetic ingredientsOpen

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.