Isostearic Acid

Isostearic acid is a branched-chain fatty acid used in cosmetics as an emollient and binder. It helps to soften and smooth the skin, and can also improve the texture and stability of formulations. Its branched structure makes it less prone to oxidation than straight-chain fatty acids.

BenefitModerate 1.5 / 4

Hydration i1.5 / 4

Whether the ingredient helps increase the skin’s water content — humectants that attract water, ingredients that reduce water loss, or ones that make skin feel less dry.

Barrier support i1 / 4

Whether it supports the skin barrier — restoring lipids, reducing water loss, aiding barrier repair, or strengthening the skin’s protective function.

RiskLow 0.5 / 4

Sensitization i0.5 / 4

Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.

Irritation i0.5 / 4

Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.

Rated by SpottyLabs' ingredient methodology, independent of brands.

What it helps with

• Skin conditioning
• Emollient properties
• Improves product texture

Products with Isostearic Acid

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Frequently asked questions

What is the difference between isostearic acid and stearic acid?

Isostearic acid is a branched-chain fatty acid, while stearic acid is a straight-chain fatty acid. The branched structure of isostearic acid can make it more stable and less prone to oxidation in cosmetic formulations.