The Apothecary in Diagon Alley changed hands about a year ago. The old wizard who ran it finally retired, and sold out to the The Elmsworth Sisters, who've cleaned it up and made it a viable concern once more.
Primarily staffed by the eldest sister, but all three do take turns.
Mullpepper's has become well known since their acquisition for the highest quality of potion ingredients in Diagon Alley. Everything is home grown and harvested, from the simplest herbs to the rarest venoms. Also, the potions they sell are second to none, all made in house.