Sun protection serum with vitamin U, volufiline, and peptides CUSKIN Vitamin U Sun Serum SPF 50+ PA++++

CUSKIN Vitamin U Sun Serum SPF 50+ PA++++ is a lightweight daily sunscreen serum that pairs broad-spectrum UVA/UVB protection with skincare-grade ingredients. It uses five modern photostable chemical filters and adds antioxidants, peptides, volufiline and the brand's signature Vitamin U, so a single step covers both sun protection and everyday moisture.

The texture is fluid and fast-absorbing. It sits comfortably under makeup, stays fresh in hot weather and leaves no greasy feel, no stickiness and no white cast, even after reapplication. The formula contains no synthetic dyes; the soft pink tint comes naturally from Vitamin B12.

The serum is formulated to be reef-conscious and is designed to be kind to the marine ecosystem.

Who it's for

A good fit for most skin types, including normal, combination and sensitive skin, and for anyone who wants high-factor sun protection in a comfortable, serum-light format. Suitable for both women and men as the final step in a morning routine.

How to use

Apply as the last step of your morning skincare, after moisturiser and before makeup. Smooth an even layer over the face and neck. Reapply through the day when spending extended time outdoors.

Key ingredients

Five photostable chemical filters (Uvinul T 150, Uvinul A Plus, Mexoryl SX, Mexoryl XL, Tinosorb S) – Next-generation filters that together shield skin from UVA and UVB rays. They stay stable and resist oxidising for up to 8 hours in everyday urban conditions.
Cyanocobalamin (Vitamin B12) – The "pink vitamin" that helps visibly soothe the look of redness and supports a comfortable, hydrated skin barrier, while giving the serum its natural pink hue.
Niacinamide – An antioxidant that supports the skin barrier and helps even out the look of tone and uneven pigmentation.
Vitamin E – An antioxidant that softens skin and helps protect against the visible effects of environmental stress.
Vitamin U (Methylmethionine) – CUSKIN's patented amino-acid source that helps skin feel comfortable and look smoother and firmer.
Volufiline – Helps improve the look of skin density and firmness for a smoother appearance.
Complex of 6 peptides (Hexapeptide-9, Hexapeptide-11, Palmitoyl Pentapeptide-4, Palmitoyl Tripeptide-1, Tripeptide-1, Copper Tripeptide-1) – Peptides that support a firmer, more elastic-looking complexion and help soften the appearance of fine lines.
Adenosine – Helps skin look smoother and firmer for a more youthful appearance.
Panthenol – Soothes and comforts the skin, helping it feel calm and conditioned.
Phytosterol, hydrolyzed lecithin, allantoin, multi-molecular hyaluronic acid complex – Deliver long-lasting hydration and help maintain the skin's hydro-lipid balance for a soft, supple feel.