Isoleucine

Isoleucine is an essential branched-chain amino acid naturally found in proteins that plays a role in maintaining skin structure. Cosmetic formulations use it as a skin-conditioning ingredient that can help support hydration and overall skin health.
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Ingredient Snapshot

Overview
An amino acid that helps skin hold moisture and stay smooth.
Category
Hydration, Skin Conditioning
Type
Humectant

Ingredient Ratings

Overall Rating

Good

Comedogenic Risk

None

Skin Benefits

Helps support skin hydration and conditioning by contributing to the skin's natural moisturizing factors. It may also support overall skin resilience and smoothness as part of amino acid blends.

Uses In Skincare & Cosmetics

Isoleucine is commonly used in moisturizers, serums, and formulations designed to support hydration and skin conditioning. It often appears in products that include amino acid complexes or barrier-supporting ingredients.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

Isoleucine is generally considered safe for cosmetic use and is typically well tolerated by most skin types. Irritation is uncommon, as it is a naturally occurring amino acid found in the body.

Is Isoleucine a Good Ingredient?

Isoleucine is rated Good because it's part of the skin's natural amino acid profile and helps support hydration and conditioning. It's rarely used as a standalone active, working instead as part of a broader amino acid complex, which keeps the rating solid but not exceptional.

Products with Isoleucine

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