Vitamin C Serum Blog
Evergreen guides on using vitamin C: concentrations, layering order, what it can and cannot fix, and how to tell when a serum has turned. For dated launches and price changes see news, and for product data see all serums.
How to Read the Efficacy Claims on a Vitamin C Serum
"100% of women saw brighter skin" sounds decisive until you read the footnote. A short guide to telling a strong skincare claim from a weak one.
6 Oct 2026
Airless Pump vs Dropper Bottle: Why Vitamin C Packaging Decides Shelf Life
Packaging is the part of a vitamin C serum people compare least and that affects the result most. What each format does to the active, and what to look for on the shelf.
1 Oct 2026
Vitamin C Serum Concentration: Is 10%, 15% or 20% Right for You?
A higher number on the bottle is not automatically a better serum. Here is what 10%, 15% and 20% actually change, and how to pick a strength your skin will tolerate long enough to see a result.
15 Sept 2026