For years, many years in fact, the only toner I swore by was Proactiv’s Revitalizing Toner. That was until I met Biologique Recherche’s P50. The reason my Proactiv toner was so beloved was because it contained glycolic acid. For my skin type, it was a great way to tone the skin after cleansing (very important step) and treat it. Since I’m acne-prone with oily skin the glycolic acid was an effective yet gentle exfoliant that kept my pores from becoming clogged, but also kept the surface of my skin smooth.