You are $75 away from free shipping
$
$0
This Is Why Our Lash Serum Is a Must
AGE PERFECT MAKEUP Radiant Serum Foundation with SPF 50
UNBELIEVA-BROW Longwear Waterproof Brow Gel
Your Daily, Weekly, and Monthly Skin Care Routine Schedule
AGE PERFECT® Rosy Tone Fragrance Free Face Moisturizer
REVITALIFT DERM INTENSIVES 1.5% Pure Hyaluronic Acid Serum
Should You Wash Your Hair Before You Color It?
COLORISTA Semi-Permanent Hair Color
MAGIC ROOT Precision Pen
Our 21 Best Hair Care Tips For Every Hair Type
EVERPURE Brass Toning Purple Sulfate Free Shampoo
ELVIVE Color Vibrancy Rapid Reviver Deep Conditioner
The Best Bangs for Every Face Shape and Hair Type
ADVANCED HAIRSTYLE AIR DRY IT Wave Swept Spray
ELNETT SATIN HAIRSPRAY Extra Strong Hold
Virtual Try-On
Find your next look
Haircolor Meets Makeup
Match your Brow and Hair Color Shade
WOMEN OF WORTH
Honoring extraordinary women who selflessly volunteer
Discover
Learn about the science behind skin care
Checkout our weekly live broadcast with tips from our experts
Find the perfect gift from our carefully curated selection of top beauty favorites
Browse your saved items
Procysteine Skin Benefits: Antioxidant
Procysteine, also known as koprosteine, is a modified form of the amino acid cysteine. Procysteine is a more stable version of cysteine that serves as the building block for the antioxidant glutathione. Due to its water-soluble property, procysteine is often infused into skincare formulations as a way to equip a product with antioxidant protection. In doing so, procysteine helps to protect the skin by neutralizing free-radicals present in the environment. If left unregulated, these harmful molecules can cause damage to the skin’s structural integrity, which may lead to the formation of premature wrinkles and fine lines. By effectively reducing oxidative stress, topical application of procysteine can help maintain skin quality and appearance. 1
Sign up for the latest beauty news, product samples and coupons
This sign up is for U.S. consumers. By signing up, I agree to receive emails from L'Oreal Paris and other L'Oreal brands and programs. Click to read our Privacy Policy & Terms and Conditions. Non-US consumers should visit the country website serving their region.*Required information
Thank You
Now you’ll be the first to hear about our latest beauty news, product samples and coupons and so much more. You’ll hear from us soon.