Threonine

Threonine is an essential amino acid used as a cosmetic humectant and conditioning agent. Hydrating formulas choose it to attract moisture, support a supple feel, and reinforce the look of a healthy barrier.
Like this ingredient?

Ingredient Snapshot

Overview
An amino acid that draws in moisture for plumper, more comfortable skin.
Category
Hydration, Barrier Support, Skin Conditioning
Type
Humectant

Ingredient Ratings

Overall Rating

Good

Comedogenic Risk

None

Skin Benefits

Draws in moisture to help skin feel plump and comfortable, promoting a bouncy, well-hydrated appearance and a healthier-looking surface.

Uses In Skincare & Cosmetics

Common in hydrating serums, creams, and sheet masks formulated for dryness or a tight, uncomfortable skin feel.

Comedogenic Rating

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

Safety

Widely tolerated with a very low risk of irritation. Rare individuals may experience minor sensitivity; discontinue if discomfort occurs. No notable regulatory restrictions known.

Is Threonine a Good Ingredient?

It rates Good because this amino acid works as a gentle humectant that supports skin feel and hydration, with strong formulation stability and low irritation potential. The benefits are supportive rather than transformative, which fits its role in hydrating blends rather than as a standout active.

Products with Threonine

Related Ingredients