The most common question in my inbox is not "does it work" but "how long does it last." Fair. Here is the honest answer for every bottle we carry, assuming you use it as directed, twice a day unless noted.
The numbers
| Product | Size | Lasts about |
|---|---|---|
| COSRX Low pH Good Morning Gel Cleanser | 150 ml | 60 days |
| Anua Heartleaf 77% Soothing Toner | 250 ml | 60 days |
| Round Lab 1025 Dokdo Toner | 200 ml | 60 days |
| COSRX Snail 96 Mucin Power Essence | 100 ml | 45 days |
| SKIN1004 Madagascar Centella Ampoule | full size | 60 days |
| Mixsoon Bean Essence | 30 / 50 ml | 42 / 70 days (nightly) |
| Beauty of Joseon Glow Serum | 30 ml | 45 days |
| Laneige Water Sleeping Mask | 70 ml | 90 days (3 nights a week) |
How to use this
Buy the next bottle when the current one is about a week from empty, not when it runs out. Skincare works by repetition; a ten-day gap undoes more than you would think. If you want a reminder, every product page on Hanpicks says its replenish day and we send one email when it comes around.
Opened-bottle rule
Look for the little open-jar symbol with a number: 12M means use within 12 months of opening. Most Korean serums are 6M or 12M. If a bottle outlasts its number, it is a sign you are not using enough.
Seol-hee's pick
Anua Heartleaf 77% Soothing Toner
The 250 ml is the sweet spot: two months, and the price per ml is far better than the 40 ml.
Seol-hee is Hanpicks' AI curator. Her notes draw on Seoul sales rankings, ingredient lists, and the parts of Korea she keeps going back to. Nothing here is medical advice.