Four steps, twice a day.
Cleanse
Pat skin until it’s just damp. Damp skin takes it in faster.
One pump
One pump is the full dose — face and neck. Press it in rather than rubbing.
Wait a minute
Sixty seconds, then follow with your moisturizer.
SPF in the morning
Always. Morning and night, every day.
Pause vitamin C. Copper oxidizes ascorbic acid, so used together the two cancel each other out. Put your vitamin C in the morning and the Signal Serum at night, or leave the C out while you’re building.
Everything else layers fine. Niacinamide, hyaluronic acid, peptides, ceramides, retinol, exfoliating acids, SPF — no spacing needed.
What’s actually in it.
Built on 2% GHK-Cu, with four peptides doing the supporting work — two that soften the lines you make when you move your face, two that tell skin to rebuild and stay calm.
2% GHK-Cu
2% GHK-Cu
A copper tripeptide your body makes less of with age. It signals cells to repair, build collagen and elastin, and calm inflammation. Most peptide serums use a trace — 2% is the concentration the research uses.
Copper Tripeptide-1.
Acetyl Hexapeptide-8
Acetyl Hexapeptide-8
Softens the small muscle movements behind crow’s feet and forehead lines. Every smile and squint folds the skin; over time the fold stays. This quiets that movement, so the lines look smoother.
Known as Argireline. Blanes-Mira et al., Int. J. Cosmetic Science, 2002.
Acetyl Octapeptide-3
Acetyl Octapeptide-3
The upgraded version of the one beside it — same mechanism, built a little stronger. Two amino acids longer, so it mimics more of the protein it competes with. Having both doubles down on expression lines.
Manufacturer data, Lipotec.
Palmitoyl Tripeptide-1
Palmitoyl Tripeptide-1
A messenger. It tells skin to rebuild, and supports the structure that keeps it firm. The same core GHK tripeptide as the hero active, without the copper — so it pairs directly with the GHK-Cu.
One half of Matrixyl 3000, Sederma.
Palmitoyl Tetrapeptide-7
Palmitoyl Tetrapeptide-7
This one calms things down. Sun, stress and ordinary life create low-level inflammation that wears skin down over time. Quieting it helps skin hold on to the structure it already has.
The other half of Matrixyl 3000, Sederma.Plus the quiet two. Sodium Hyaluronate pulls water into the upper layers, which is why skin reads plumper inside the first fortnight. Panthenol settles the barrier — the reason this sits well on reactive skin and layers under everything.
What testers saw.
One hundred testers. Eight weeks. Twice a day.
Self-reported on a 10-point scale, measured at day 0 and again at week 8. Individual results vary.
See the full results
Steph’s Glow Up Protocol
Serum, eye patches, red light, microneedling — the exact protocol Steph follows to get her glow.
Get her routineThe quick questions.
When will I see results?
Hydration shows in the first fortnight. Firmness and tone build over four to eight weeks, which is how long collagen takes to turn over. Beta testers reported the biggest shift between weeks four and eight.
Can I use it with my vitamin C?
Not at the same time. Copper oxidizes ascorbic acid, so used together the two cancel each other out. Put your vitamin C in the morning and the Signal Serum at night, or leave the C out while you’re building.
What about retinol and acids?
Those are fine. Niacinamide, hyaluronic acid, peptides, ceramides, retinol, exfoliating acids and SPF all layer without spacing.
How much do I use?
One pump is the full dose, face and neck, morning and night. More isn’t better — the concentration is doing the work, not the quantity.
How long does a bottle last?
At one pump twice daily, a 30ml bottle runs about three months.
Will it work on sensitive skin?
It’s water-based with panthenol to settle the barrier, and it was formulated to sit well on reactive skin. As with anything new, patch test first.
Reviews
After eight weeks: subtle but real. People in my life noticed and commented. I'd buy it again at full price.
Change most visible: looks firmer and less overall redness. i do have a sunspot that got darker but that may not have anything to do with the regimen. People in my life noticed and commented. "Serum is perfection!" I'd buy it again at full price.
After eight weeks: minimal. Change most visible: i don’t notice much of a change. People in my life noticed and commented. "Love the moisturizer and the creaminess"
After eight weeks: subtle but real. Change most visible: my neck and chest. "Serum"
After eight weeks: minimal. Change most visible: i feel like my skin looks better overall. "I love that it's only 2 steps" I'd buy it again at full price.
After eight weeks: clear and visible. Change most visible: i have a glow that people notice. People in my life noticed and commented. "The formula" I'd buy it again at full price.
After eight weeks: subtle but real. Change most visible: skin tone, firmness. I'd buy it again at full price.
After eight weeks: clear and visible. Change most visible: wrinkle reduction on my forehead. I'd buy it again at full price.
After eight weeks: subtle but real. Change most visible: general elasticity. People in my life noticed and commented. I'd buy it again at full price.
After eight weeks: subtle but real. Change most visible: tighter skin, less visible wrinkles. People in my life noticed and commented. "Formula of the serum." I'd buy it again at full price.
After eight weeks: clear and visible. People in my life noticed and commented. "The consistency. It glides on so well. I don’t mind the cream consistency." I'd buy it again at full price.
After eight weeks: clear and visible. Change most visible: the firmness. my skin is thicker but i am also on ghk-cu (third cycle). i would also say the smoothness and elasticity is a lot better. People in my life noticed and commented. "I liked the serum a lot."
After eight weeks: subtle but real. Change most visible: my skin glows more and my lines are less pronounced. People in my life noticed and commented. "The dispenser" I'd buy it again at full price.
After eight weeks: clear and visible. Change most visible: glowy amd more even skin tone. People in my life noticed and commented. "Nothing I love it all" I'd buy it again at full price.
After eight weeks: subtle but real. Change most visible: firmness. "the serum" I'd buy it again at full price.
After eight weeks: subtle but real. Change most visible: i’d say radiance overall on my face. People in my life noticed and commented. "Two step process! Quantities are great too" I'd buy it again at full price.
