What do symbols like 6M, 12M, 24M mean on cosmetics?

Cosmetic packages display an open jar symbol with a number and the letter "M" — such as 6M, 12M or 24M. It indicates the product's shelf life after opening (PAO — Period After Opening), meaning how many months the cosmetic retains its properties and remains safe to use. It is not an expiration date, but guidance on when to use the product after opening the package. Many consumers confuse this symbol with a best-by date, which can lead to using expired cosmetics.

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