Why Isn’t Every Sage Oil the Same?

A bottle labelled “sage essential oil” may sound like a clearly defined product, but chemically, sage oils can differ considerably.

The essential oil of Salvia officinalis usually contains three particularly important groups of compounds: thujones, camphor and 1,8-cineole. Their proportions, however, can change according to the plant’s genetics, geographical origin, growing conditions and harvest time.

Scientists call these chemically different forms chemotypes. Two plants belonging to the same species can therefore produce oils with noticeably different chemical profiles.

With sage, this is more than a botanical curiosity. Thujone content is particularly important for safety, so knowing exactly which sage and which type of preparation is being used matters.

It is a good example of an important lesson from modern herbal research: the name of the plant alone does not always tell us everything about what is inside it.