My Her Ampoule has expired. How long can I use it? It’s been quite a while—just under 10 years. I used it because of its refreshing scent and unique hair treatment effect. It is a hair ampoule that coats the hair itself with its distinctive oil components. I used it frequently because it visibly revitalized my hair. One day, I used two bottles in a row, and I think I’ve used about 24 in total. I got tired of it, and it felt like it wasn't absorbing into my hair anymore, so I stopped using it. Lately, however, my hair ends have been weak, thin, and brittle, so I was thinking of applying it again after cleansing and rinsing it off like a conditioner. But I’m hesitant to use it because I worry it might clog my pores. However, since the scent is refreshing, I think it would be fine to use. Does an expired ampoule lose half or all its effectiveness, or is it harmful to the human body?
