Cysteamine
BrighteningAntioxidantNaturalAlso known as: Cysteamine HCl, Cysteamine Hydrochloride
A naturally occurring aminothiol with potent depigmenting activity. Works through multiple mechanisms to reduce melanin production.
Routine placement
Serum · AM & PM
Time to results
6-12 weeks for visible brightening and dark spot fading
Potent depigmentation, multiple mechanisms of action, antioxidant, treats melasma and post-inflammatory hyperpigmentation.
Apply at night. Typical protocol: apply, wait 15 minutes, then rinse off. Follow with moisturizer.
Randomized controlled trials show non-inferiority to hydroquinone 4% for melasma with better safety profile. Works via chelating copper and scavenging free radicals.
Cautions
Has an unpleasant sulfur-like odor. Can cause temporary redness and irritation. Rinse-off protocol reduces side effects.
What does Cysteamine do for skin?
Cysteamine is used in skincare primarily as a brightening ingredient. Its effects depend on concentration and formulation. Check the benefits section above for specific details.
Is Cysteamine safe for sensitive skin?
Cysteamine is generally well-tolerated, but sensitivity varies by individual. Start with a patch test if you have reactive skin, and introduce gradually into your routine.
Can I use Cysteamine every day?
For most skin types, daily use is appropriate at standard concentrations. If you experience any irritation, reduce frequency to every other day.
How long does Cysteamine take to fade dark spots?
Most brightening ingredients take 8-12 weeks of consistent daily use to show visible improvement in hyperpigmentation. Results vary by skin tone and spot severity.
Does your skincare contain Cysteamine?
Paste your product's ingredient list to check, or create your Skinularity ID for a full routine.
Find Cysteamine products
Browse skincare products containing Cysteamine.
Related to Cysteamine
An extract from the yuzu citrus fruit, popular in J-beauty. Rich in vitamin C, hesperidin, and limonene.
A versatile form of Vitamin B3 that strengthens the skin barrier, reduces pore appearance, controls oil production, and addresses multiple skin concerns.
A fat-soluble antioxidant that protects cell membranes from oxidative damage. Works synergistically with Vitamin C for enhanced photoprotection.
A naturally occurring dicarboxylic acid with antibacterial, anti-inflammatory, and antioxidant properties. Effective for acne, rosacea, and hyperpigmentation.
A stimulant compound commonly used in eye creams and body products for its ability to constrict blood vessels, reduce puffiness, and provide antioxidant protection.