Wikipedia
Sanatogen was a " brain tonic" invented by the Bauer Chemical Company, in Germany in 1898 and sold worldwide
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". The product became fashionable in China in the early 20th century and won the favour of many renowned people.
The indications or uses for this product provided by the manufacturer were: "Food tonic. A concentrated nutrient with tonic properties. It is very easily digested and absorbed and is recommended as an effective means of reinforcing the daily diet of aneamic and convalescent patients, including children, and in cases of weakness and exhaustion from overwork or illness."