I can remember the small bottles of olive oil. In fact, when my mother moved in the 1980s. I can remember disposing of one that must have been at least 25 years old. Many products sold by chemists off-prescription were poisonous then. You used to be able to get large tins of caustic soda flakes at a very reasonable price compared to the exorbitant price for solutions of the same thing today sold for drain cleaning. Similarly Golden Eye ointment, now a relatively harmless product and still available, then contained mercury. So it was understandable that they were careful who they employed selling it. Don't think they sold Arsenic like in Victorian times though !