How to Store a Silk Serum and Read Its Shelf-Life Symbol
Shop the silk serum →The Small Open-Jar Symbol Few People Know How to Read
The open jar icon with a number followed by the letter M, found on most cosmetics, indicates the recommended usage period after opening, in months — not the sell-by date, which is often confused with this information.
Good Storage Practices That Actually Extend Shelf Life
Keeping the bottle away from direct light and heat, carefully closing the dropper after each use, and avoiding leaving it in a very humid bathroom preserves ingredient stability far beyond careless storage.
"The '12M' symbol means twelve months of optimal use after opening, not twelve months before the product becomes dangerous — a nuance that avoids throwing away a still perfectly usable product.
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| Factor | Storage to Avoid | Recommended Storage |
|---|---|---|
| Light exposure | Sunny windowsill | Closed drawer or cabinet |
| Temperature | Very hot/humid bathroom | Temperate, dry room |
| Bottle closure | Left ajar | Properly closed after use |
A Simple Detail That Avoids Needless Waste
Checking the open-jar symbol and adopting a few basic storage habits allows full use of a serum's intended shelf life, without waste or unnecessary doubt about its freshness.
