Sanatogen was a "brain tonic" invented by the Bauer Chemical Company, in Germany in 1898 and sold worldwide[1] In the US it was advertised as a "nerve revitaliser".

The medicine was prohibited in Australia in 1915 during World War I and a British-made substitute "Sanagen" was introduced to the Australian market the following year, claiming to be "identical to Sanatogen".

A concentrated nutrient with tonic properties... easily digested and absorbed and is recommended as an effective means of reinforcing the daily diet of anaemic and convalescent patients.

[3] In 1913 the product was at the centre of a United States Supreme Court case: Bauer & Cie. v. O'Donnell.

[5] Sanatogen is also the name of a modern multivitamin product manufactured by Fisons before being sold to Roche, and later Bayer.