COSRX The 6 Peptide Skin Booster Serum 150mL

Why it's here: it went to number one across all of Olive Young the week it launched, and it has stayed on the shelf since.

The 6 Peptide Skin Booster Serum is a watery first-step serum you use right after cleansing. Six peptides and niacinamide help skin look firmer, smoother and more even over weeks, and the texture is so light it disappears before your next step. Think of it as a toner that works harder.

Key ingredients

• Six-peptide complex
• Niacinamide
• Hyaluronic acid

How to use

First step after cleansing, morning and night. Pour a few drops into your palms and press into skin, then continue with serum and moisturizer.

Good for

Dull, tired skin and the first fine lines. All skin types.

Authentic COSRX, bought in Seoul per order. Ships in 2 to 4 business days, then 3 to 5 days to Canada or the US.