Copper peptides
The science-led core of the formula, presented without overcomplicating the routine.
GHK-Cu Copper Peptide Serum · 50 Years of Skin Science
A couple of seconds away
from the
best you've ever looked
매일 밤의 리츄얼
A copper-peptide (GHK-Cu) serum built on fifty years of published skin research — applied like a ritual, once a night.
Suna Copper Peptide Serum — Firming & Hydrating Face Serum · View product
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The Science
What Are Peptides?
피부 과학
Peptides are short chains of amino acids — the same building blocks your skin uses to make collagen and elastin. In skincare, they act as signaling molecules: certain sequences tell skin cells to behave the way they did when you were younger. GHK-Cu is the most studied of these — a copper-bound peptide your body already produces, in smaller amounts as you age.
01
Amino Acids
The basic units peptides are built from — the same molecules your body uses to construct every protein in skin, including collagen.
02
Signaling, Not Just Hydration
Unlike a humectant that just holds water, a peptide can act as a message — prompting skin cells to behave a certain way, which is why sequence matters more than concentration alone.
03
Copper Peptides
A specific peptide bound to a copper ion (like GHK-Cu). Identified in human plasma in 1973, and one of the more studied peptide complexes in skin literature since.
See the copper peptide serum behind the formula.
Shop Copper Peptide SerumReal Results, Going Viral - Limited Stock
The Ritual
A few drops. Clean skin. Done.
A lightweight copper peptide serum designed to slot into the routine you already have. Apply a few drops, let the formula settle into the skin and follow with moisturiser when you need it.
- 01Apply 2–3 drops to clean, dry skin.
- 02Gently press and smooth over the face and neck.
- 03Follow with moisturiser if your skin needs it.
Inside the formula
AQUA · GLYCERIN · SODIUM HYALURONATE · COPPER TRIPEPTIDE-1 · PANTHENOL
Copper tripeptide-1,
named once.
Also known as GHK-Cu. Identified in human plasma in 1973, studied in skin repair since the 1980s. Naturally present in the body; less abundant with age. Fifty years of published literature, stated plainly and once. We name the year, not the p-value.
Explore the serumHyaluronic acid
A familiar hydration ingredient that supports a softer, more comfortable skin feel.
Lightweight texture
A few drops fit easily into the routine you already use, morning or evening.
Who We Are
One honest step, instead of ten uncertain ones
Suna started with a simple frustration: most skincare routines ask a lot and explain very little. We wanted the opposite — one formula built around GHK-Cu, a copper peptide studied in skin science since the 1970s.
The quiet, ritual-driven pace we borrow is inspired by a philosophy long associated with Korean and Japanese skincare traditions: that consistency, not complexity, is what actually changes skin over time. We're a small team who studied the science and built one honest product around it.
Consistent Use
Eight weeks.
Every night.
Baseline
First night
Night 56
Consistent nightly application
Individual results vary. This is a cosmetic — appearance claims only. Not intended to diagnose, treat, or cure any condition.
Questions
The small things
that matter.
Keep it away from acids and vitamin C in your evening routine. Apply it last, after any actives have fully absorbed.
Most people report noticing a change after four to six weeks of consistent nightly use. The full ritual is designed around eight weeks.
GHK-Cu is naturally present in the human body. As with any new skincare product, we recommend a patch test first.
A dropper gives you a precise, controllable dose — no over-dispensing, no waste. The cobalt glass also blocks light, which keeps the peptide stable.
Barely anything. Minimal, neutral scent — no added fragrance.
Choose from 30, 60, 90 or 120 ml depending on how long you want your nightly ritual to last. The formula is the same in every size.
Yes — most people alternate nights: retinol one night, GHK-Cu the next, so each ingredient works without competing. If you'd rather not alternate, apply GHK-Cu first and give it a few minutes before layering retinol on top.
A naturally occurring copper peptide — copper tripeptide-1 — first identified in human plasma in 1973. Levels decline with age, which is why it's formulated into skincare rather than relied on alone.