The Bio-Strath Circuit [1] was a series tour of British tennis tournaments sponsored by the Swiss company Bio-Strath AG,[2] a producer natural food supplements for sports people from 1970 to 1971.
The circuit usually began in mid spring in April and ended in late summer in early August.
In October 1971 Bio-Strath AG decided not to renew its sponsorship agreement with tournaments, due to disagreements of prize money and the circuit was discontinued.
It began on 4 May in Birmingham, West Midlands, England with the first leg being the Bio-Strath Tally Ho event, and ended on 8 August with the tenth and final being the Bio-Strath West Warwickshire Open at Solihull.
The first leg of the circuit began on 9 April with the Bio-Strath Tally Ho event, and ended on 7 August with the thirteenth and final leg the Bio-Strath West Warwickshire Open at Solihull.