A format choice, not a potency ranking
A hydrogel holds the formula in contact with skin during use. A serum spreads in a thin layer; concentration and the complete formula vary, so do not infer stronger performance from format alone.
Use the relevant wear cue
Night ☾ GHK-Cu Copper Peptide Hydrogel Mask: Cleanse and apply toner, remove the backing and smooth the mask onto your face. Wear it until it turns transparent, so you know your skin has absorbed the essence. Then remove and gently massage the remaining essence into skin. Follow with moisturiser as needed, then sleep on the massaged-in essence. Use SPF in your daytime routine.
Keep layering readable
Patch test and introduce one new product at a time. Separate unfamiliar strong actives at first. Stop if discomfort develops, and keep daytime SPF in the routine.
Choose a schedule, then choose boxes
The Double Duo combines 2 Copper boxes and 2 Kojic boxes: 20 masks for 10 day and 10 night rituals a month, at $199 one-time or $169/month. The first 500 subscribers are Founding Members who lock $169/month for life.
Subscriptions default to monthly, with every 2 months available in settings. Swap, skip or cancel any time. Each box contains 5 individually sealed masks, 34 g each.
Side by side
| Detail | GHK-Cu mask | Peptide serum |
|---|---|---|
| Format | Hydrogel sheet removed after use | Leave-on liquid; follow its label |
| Wear cue | Until it turns transparent | No universal visible cue |
| Routine role | Selected evening rituals | Frequency depends on the formula |
| Amount | 5 sealed masks, 34 g each per box | Varies by bottle |