Yes, hair products do expire, and using them past their recommended period can reduce effectiveness or cause irritation. Expiration is usually determined by time after opening, storage conditions, and visible changes in the product.
Why this happens:
Over time, preservatives lose effectiveness and ingredients can degrade, especially once a product is exposed to air, light, or moisture. This can change how a product performs and how it interacts with the scalp.
Common factors that can contribute:
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Time since opening
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Exposure to heat, humidity, or sunlight
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Changes in smell, texture, or color
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Contamination from fingers or water
How to support scalp and hair health:
Check packaging for a “period after opening” symbol, store products in cool, dry places, and discontinue use if a product smells off or separates unusually. Fresh, well-preserved products are gentler and more reliable for scalp care.
When to reassess:
If a product causes irritation or discomfort, stop using it and consider replacing it.
