- Keep unopened bottles no more than three years
- Keep opened bottles no more than 18 months
- Write your date of purchase on the bottom of the bottle in a sharpie
- If a product smells bad or feels funny in your hands or on your scalp, you can be sure the product is out of date and should be thrown away.
- Although the FDA doesn’t require manufacturers to put expiration dates on hair products, when opened, shampoos and conditioners lose their effectiveness after 18 months