HOW LONG DOES THE HAIR SERUM KEEP FOR?
Once opened, the HAIR ACTIVATING SERUM should be used up within six months. If unopened, the product can last for at least five years.
https://www.m2beaute.com/en/hair-care-faqs/m2-beaute-hair-activating-serum/how-long-does-the-hair-serum-keep-for