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Cosmetics shelf life
Hi! I see brands with water-based cosmetics (like emulsions) that have 3+ years of shelf stability. Nevertheless, some products show significant changes in their fragrance (especially, their intensity), or thickness (some creams for instance, become very thick), not to mention preservative’s efficacy. Are they applying the “3-months of accelerated stability = 1 year of shelf life” rule? is this the only consideration to determine a product’s shelf life?
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3 Replies
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Stability is not an exact science and whether something passes or not is often a matter of opinion. In general, something “passes” stability if it doesn’t change significantly over the course of the stability test. The “3 months accelerated = 1 year shelf life” is only approximately correct. You still have to complete the 1 year testing to see if it is accurate for any given system.
I suspect many companies don’t bother once a product is launched an on the shelf. Many products do an initial product run and then never sell out to have another run made.
As an aside, it was always a fun moment to actually find the remaining 52 week stability test samples (4C, RT, 37C). So many were moved or just mysteriously lost in our stability storage areas.
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Add the silliness of PoA .
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Thank you @Perry and @PhilGeis, I appreciate your comments.
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