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Leucine

Leucine is an essential amino acid, a building block of proteins. In cosmetics, it functions as a skin and hair conditioning agent, helping to maintain hydration and improve the overall appearance of the skin and hair. It can also support the skin's natural barrier function.

NoneAmino acidEvidence: Medium

BenefitModerate 1.5 / 4

Hydration i0.8 / 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.

Soothing i0.5 / 4

Whether it can calm the skin — linked to less redness, irritation, discomfort, or visible reactivity.

Texture i0.5 / 4

Whether it can improve smoothness and surface texture — roughness, flaking, clogged pores, or unevenness. Exfoliating acids, retinoids, and smoothing moisturizers may score here.

Uv protection i0.2 / 4

Whether it provides direct protection against UV radiation.

RiskVery low 0 / 4

Rated by SpottyLabs' ingredient methodology, independent of brands.

What it helps with

conditions skin
conditions hair
supports skin barrier

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Products with Leucine

Sebamed

Sensitive Skin Liquid Face & Body Wash

3.9/ 58/15/9

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