Why is the serum blue?

Most face serums are colourless. Ours is a clear blue — and nothing is added to make it that way.

The colour comes from copper

The serum contains copper tripeptide-1, often written GHK-Cu: a small peptide made of three amino acids — glycine, histidine and lysine — holding a copper ion. Like many copper compounds, this complex absorbs part of the warm, red end of visible light. What reaches your eye is the blue that is left.

So the blue is not a dye, and not a tint added for show. It is simply what the copper peptide looks like in a water-based serum.

Why the bottle looks blue

The bottle itself is clear. We chose a transparent airless bottle and a clear label so that you see the serum, not the packaging. Against the stone-coloured carton, the formula's own colour does the work — the single blue line on the pack simply echoes what is inside.

Kept cool, kept closed

The airless pump keeps air out between uses, and the serum lives in the fridge. That is all the ritual it needs.

Read more: What is GHK-Cu?