Blue Osien

Skin-Firming Face Serum. A constellation of nine peptides.

Blue Osien is the treatment at the center of the MARSEL KEI ritual — a weightless, oil-free serum with a signature whisper of blue. Within it, a 9-peptide complex works in concert with copper tripeptide, the prized molecule that lends the serum its colour, alongside ectoin and a deep hydration matrix. Skin looks smoother, firmer and more luminous from the first application. Worn beneath YJOR, it is the step that makes the whole ritual sing.

What it does

• Visibly refines texture — the nine-peptide complex helps smooth the look of fine lines and uneven texture.
• Leaves skin looking firmer & more lifted — for a smoother, firmer-looking appearance.
• Plumps & cushions with hydration — a hydration matrix of saccharide isomerate, sodium PCA and glycerin.
• Lends a luminous finish — skin looks fresh, dewy and radiant.
• Helps defend against environmental stress — ectoin helps defend against the visible effects of daily environmental exposure.

Hero ingredients

• Copper Tripeptide-1 — the prized, beautifully blue peptide at the heart of the serum — for firmer, smoother-looking skin.
• The Nine-Peptide Complex — a constellation of peptides that together refine the look of lines and firmness.
• Ectoin — helps defend against the visible effects of daily environmental stress.
• Hydration Matrix — saccharide isomerate, sodium PCA and glycerin for plump, lasting-feeling moisture.

How to use

On clean skin, dispense 2–3 drops and smooth over the face and neck, morning and evening. Allow to absorb fully, then layer YJOR cream on top. By day, finish with sun protection.

Who it’s for

For every skin tone seeking firmer, smoother, more luminous-looking skin. Oil-free and lightweight. No added fragrance.

Good to know

This serum contains sh-Oligopeptide-1 (epidermal growth factor, or EGF). If you are pregnant or nursing, please consult your physician before use.