The first human trials of heparin began in May 1935, and, by 1937, it was clear that Connaught's heparin was a safe, easily available, and effective as a blood anticoagulant.
Os primeiros ensaios humanos coa heparina comezaron en 1935, e, en 1937, estaba xa claro que a heparina dos laboratorios Connaught era segura, de fácil dispoñibilidade e efectiva como anticoagulante sanguíneo.