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Skincare Ingredient

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Isobutyl Stearate

In Skincare: Is Isobutyl Stearate Safe? Comedogenic Rating & Side Effects

Comedogenicity (pore clogging)
3/5 — Moderate risk
Safety (overall safety)
2/5 — Low risk
Irritancy (skin irritation)
1/5 — Very low risk

Safety Information

Isobutyl Stearate is a fatty acid ester used as an emollient; generally low in irritation and considered safe in cosmetics. Limited safety data is available, but it is not typically associated with significant toxicity or allergenic potential based on current cosmetic ingredient reviews.

Overview

Ingredient Profile

Isobutyl stearate is a stearate ester derived from reacting stearic acid with isobutyl alcohol. Stearate esters are oily liquids or waxy solids commonly used in cosmetics and personal care products, particularly in formulations for eye makeup, skin makeup, lipstick, and skincare.
Classifications
Emollient
Texture Enhancer

Data & Research

Scientific Facts

Stearate esters are produced through the chemical reaction between stearic acid (a fatty acid found in animal and vegetable fats) and an alcohol – specifically, isobutyl alcohol. These esters exhibit low viscosity and an oily nature, forming a hydrophobic film on the skin or lips when applied.

Common Uses

Formulation in Isobutyl Stearate

Stearate esters, including isobutyl stearate, function primarily as lubricants on the skin’s surface, contributing to a smooth and soft feel. Butyl stearate can also reduce the viscosity of lipsticks, improving application, and imparts water-repelling properties to nail polishes. Isocetyl stearate can be utilized as a solvent for dissolving other ingredients, typically liquids.

Role of Isobutyl Stearate

Active Cosmetic Mechanisms

SKIN CONDITIONING

Skin Enhancer

Maintains skin in good condition and improves its feel

SCIENTIFIC ANALYSIS

// Evidence: Skin conditioning ingredients enhance appearance, texture, and health of skin through various mechanisms. This broad category encompasses emollients, humectants, occlusives, and other agents that improve skin feel, appearance, and function. May work by moisturizing, smoothing, softening, or protecting skin. Effects include improved tactile properties, enhanced barrier function, and better overall skin condition.

SKIN CONDITIONING - EMOLLIENT

Skin Softener

Softens and smooths skin by filling gaps between cells

SCIENTIFIC ANALYSIS

// Evidence: Emollient ingredients create smooth, soft skin by filling spaces between corneocytes in stratum corneum. These include esters (isopropyl palmitate), oils (jojoba, argan), fatty alcohols, and silicones. The mechanism involves spreading on skin surface, filling microscopic irregularities, and creating lubricious film. Effects are immediate tactile improvement and visual smoothing. Emolliency measured by spreading coefficient and skin feel assessments.

Products

containing Isobutyl Stearate

3 formulations
Solbar Avo SPF 35
Solbar Avo SPF 35
Person & Covey, Inc. · sunscreen
Solbar Shield SPF 40
Solbar Shield SPF 40
Person & Covey, Inc. · sunscreen
Solbar Thirty SPF 30
Solbar Thirty SPF 30
Person & Covey, Inc. · sunscreen
Semantic Analysis

Similar Ingredients

Ingredients with similar chemical profiles and skincare properties.

Frequently Asked Questions

Isobutyl Stearate — common questions

What is Isobutyl Stearate in skincare?

Isobutyl stearate is a stearate ester derived from reacting stearic acid with isobutyl alcohol. Stearate esters are oily liquids or waxy solids commonly used in cosmetics and personal care products, particularly in formulations for eye makeup, skin makeup, lipstick, and skincare.

What does Isobutyl Stearate do? / Functions of Isobutyl Stearate?

Common functions: SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT.

What is the comedogenic rating of Isobutyl Stearate? / Is Isobutyl Stearate comedogenic?
3 3/5 — Moderate risk

Isobutyl Stearate has a comedogenic rating of 3 out of 5. A rating of 3 means it has moderate comedogenic potential.

Does it clog pores?
May Clog Pores for Some

Isobutyl Stearate has a moderate comedogenic rating of 3/5.

Is Isobutyl Stearate safe for skin?
2 2/5 — Low risk

Isobutyl Stearate has a safety rating of 2 out of 5. A rating of 2 means it is generally considered safe for most skin types. Note: Isobutyl Stearate is a fatty acid ester used as an emollient; generally low in irritation and considered safe in cosmetics. Limited safety data is available, but it is not typically associated with si

Is Isobutyl Stearate good for sensitive skin?
1 1/5 — Very low risk

Isobutyl Stearate has an irritancy rating of 1 out of 5. A rating of 1 means it is generally well-tolerated.

What are the side effects of Isobutyl Stearate in skincare?

Known considerations: Isobutyl Stearate is a fatty acid ester used as an emollient; generally low in irritation and considered safe in cosmetics. Limited safety data is available, but it is not typically associated with significant toxicity or allergenic potential based on current cosmetic ingredient reviews. Additional risks: potential pore-clogging (comedogenic rating 3/5).

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