The ingredient, explained

Cystine

A primary study examines this ingredient in the specified preparation and setting.

AntistaticHair conditioningMasking

Explore connections

Ingredient guide

What it is and what it does

Cystine

About this ingredient: EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗

Antistatic: Reduces the build-up of static electrical charge on surfaces.
Hair conditioning: Improves cosmetic hair properties such as softness, shine or combability.
Masking: Reduces or conceals the formula's underlying odour or taste.

Function definitions: European Commission ingredient function definitions (SCCNFP/0299/00, pages 16 to 20) ↗

Registry functions describe possible formulation roles, not results for a finished product. A dictionary entry is not an approval or a safety assessment.

A closer look

What the research shows

Human oral research

Adding a four-ingredient oral supplement to pharmacological alopecia treatment increased assessor-rated improvement compared with medication alone.

What this does not tell us

Mixture with plant extracts and vitamin C plus pharmacological treatment. Oral route, not topical. Six calendar months not converted into unsupported days.

Sources for this summary. PubMed 40853071 ↗

Research review checked Oct 1, 2026

Bounded review of local candidates, exact-name indexed primary journal/PubMed safety and topical searches; not a systematic review.

Ingredient research is not proof that a product containing this ingredient works.