Yellow bottle of shower gel on blue background. Minimalism, conceptual photo, photo with shadow.
Ever wanted to pick the brain of a beauty editor? Or get beauty product recommendations from someone who has tried them all? You’ve come to the right place. In our weekly series, Ask a Beauty Editor, beauty editor Hana Hong answers your biggest skincare, haircare, and makeup questions, all submitted by Real Simple readers. Tune in every Tuesday and submit your own burning beauty questions here for a chance to be featured.
Reader question: When should I throw away old shampoo/conditioner, or is it OK to keep using it? – @lizmaloof
Here’s the hard truth: All beauty products expire.
This is especially hard for people like me, who have a tendency to hoard beauty products to “save for later.” But alas, all beauty products have a shelf life, and your shampoo/conditioner is not immune.
Don’t believe me? Take it from two cosmetic chemists who spend their careers making them. “Most shampoos will last for 18 months after being opened and will be marked with a PAO (period after opening) on the label,” says Vince Spinnato, cosmetic chemist and founder of TurnKey Beauty Inc. “If the bottle has never been opened, it will expire three years from the date of purchase.”
Keep in mind, some products will have a PAO (period after opening) number listed on the back, labeled as 12M, 18M, or 24M where M stands for months. This indicates how long the product is good for after opening. “If it’s a true GMP compliant facility who is making the product, this is something they test to ensure its efficacy after a certain period of time through an accelerated shelf life testing process,” says cosmetic chemist David Petrillo. “If it does not have a PAO, contact the company and see if you can reference a batch number to the product, which the manufacturer should be able to match up with when it was produced.”
But let’s be honest—most of us probably don’t remember when we opened our shampoo. If you’re not sure, there are some visual clues you can reference. “Expired shampoo will eventually start to make physical changes. This means the color, texture, and smell will change to the point that it doesn’t look or smell right,” says Spinnato.
As a rule …….