Thioctic Acid

Thioctic acid, also known as alpha-lipoic acid, is a small sulfur-containing antioxidant soluble in both water and oil. Cosmetics use it for antioxidation and to refine the look of tone and texture, and it's backed by fairly well-established research.
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Ingredient Snapshot

Overview
Alpha-lipoic acid, a well-studied antioxidant that smooths and refines skin.
Category
Antioxidant, Anti-aging, Tone/Texture
Type
Antioxidant

Ingredient Ratings

Overall Rating

Good

Comedogenic Risk

None

Skin Benefits

Improves the look of radiance and smoothness while helping counter environmental oxidative stress, and can visibly refine the appearance of pores and uneven texture.

Uses In Skincare & Cosmetics

Included in targeted serums, face creams, and eye formulas, often positioned in resurfacing, brightening, or age-supporting products.

Comedogenic Rating

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

Safety

Generally safe for topical use, but may cause transient stinging or irritation, especially at higher concentrations or when layered with strong exfoliants or retinoids. Introduce it gradually and avoid broken skin. No common regulatory constraints noted.

Is Thioctic Acid a Good Ingredient?

It rates Good because alpha-lipoic acid is a well-characterized antioxidant with both water- and oil-phase activity and some clinical support for improving texture and radiance. It's relatively stable and effective at low levels, though it can tingle on sensitive skin, which keeps it just shy of Great.

Products with Thioctic Acid

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