Key takeaways
- Keep serum away from heat, direct sun and steamy bathrooms.
- Close the cap tightly after each use.
- Check the 'period after opening' symbol on the pack.
Storage basics
- Cool, dry place, out of direct sunlight.
- Not on a sunny windowsill or next to a hot shower.
- Cap closed tightly to limit air exposure.
- Don't touch the dropper tip to your skin.
How long it lasts
Look for the open-jar symbol with a number like 12M, meaning 12 months after opening. Used twice a day, a 38 mL bottle of DOSE lasts about 30 days, well within that window.
Signs it's past its best
Copper peptide serums are naturally blue from the copper; that colour is normal.
- A noticeable change in smell or texture.
- Separation that doesn't mix back.
- A significant colour change.
Travelling
Keep your bottle in a zip bag in your carry-on and out of hot cars.
FAQ
Should I keep my serum in the fridge?
It isn't necessary. A cool, dark cupboard is fine.
How long does one bottle last?
About 30 days at 3–4 drops twice a day.
Why is my copper peptide serum blue?
The blue comes from the copper in GHK-Cu. It's normal.
This article is for general information only and isn't medical advice. DOSE is a cosmetic product and is not intended to diagnose, treat, cure or prevent any disease. Individual results vary.