What it is:

COSRX The 6 Peptide Skin Booster Serum is a lightweight Korean skincare serum designed to prep, hydrate, and visibly improve overall skin condition with a multi-benefit approach. Often used as a first-step treatment after cleansing, this watery booster helps support smoother texture, balanced hydration, and a fresher, more refined look. Its fast-absorbing texture sinks in effortlessly without stickiness, making it easy to layer with the rest of your skincare routine. Created for daily use, this peptide serum helps leave the complexion looking softer, healthier, and more energized while enhancing the feel and finish of the products applied afterward. For anyone looking to elevate a modern Korean skincare routine, this skin booster offers a premium balance of lightness, versatility, and targeted care.

Who it’s for

This serum is ideal for those who want to address multiple early skin concerns at once, including dehydration, dullness, uneven texture, and the first visible signs of aging. It is especially suited to shoppers looking for a lightweight peptide serum that fits easily into both simple and advanced routines. Because of its fluid, non-heavy texture, it works well for normal, combination, oily, and even dehydrated skin types. It is also a great choice for those who want a preparatory treatment that supports smoother, healthier-looking skin without feeling rich or occlusive.

Why it’s special

What makes this serum special is its elegant booster format and versatile daily performance. It feels weightless on the skin yet delivers a noticeable sense of hydration, softness, and refinement. The formula is designed to help the complexion look smoother, clearer, and more balanced, making it an easy addition for those who want visible skin maintenance without a complicated routine. Its layering-friendly texture and polished finish make it especially appealing for shoppers who want premium Korean skincare that feels effortless but effective.

Ingredients that make the difference 

Acetyl Hexapeptide-8
A well-known peptide that helps improve the look of fine lines and supports a smoother, more refined skin texture.

Copper Tripeptide-1
A peptide that helps support healthier-looking skin and contributes to a firmer, fresher, and more resilient appearance.

Niacinamide
Supports brighter, more even-looking skin while helping improve overall clarity and the appearance of texture.

Who can use it?

COSRX The 6 Peptide Skin Booster Serum is suitable for most skin types, including normal, combination, oily, and dehydrated skin. It is especially beneficial for those seeking lightweight hydration and early anti-aging support, or for anyone wanting to improve the look of texture and radiance in a gentle, layerable way. Its watery texture makes it easy to use morning and night under other serums and moisturizers. As with any skincare product, patch testing is recommended before first use, especially for very sensitive skin.