of Hanger Lane, Ealing, London, W5. Telephone: Wembley 3201. Cables: "Corpuscles, Ealux, London"
1899 Virol was produced experimentally by Bovril, in their Old Street factory in London.
1900 The company was registered on 20 January, to take over the business of manufacturing and selling the food known as Virol. 
1900s Demand grew and Bovril set up Virol as a separate company.
1920 The production of Virol moved to Perivale, Middlesex, where the premises were larger and more modern.
1929 Listed Exhibitor - British Industries Fair. Manufacturers of Virol, Virolax, Virol and Milk. (Stand Nos. K.21 and K.32) 
Pre-WWII. Virol became associated with Ambrosia to produce Virol and Milk in direct rivalry with Horlicks.
WWII. Sometime during the wartime period, production ceased as it proved too costly to manufacture.
Post-WWII. Virol changed hands several times.
1971 Bovril, (and therefore Virol) was taken over by Cavenham Foods.
1977 Virol was sold to Janks Brothers of High Wycombe.
1979 Optrex bought Virol.