From 1922 to 1978, Nurse Caisse gave Essiac to thousands of people at her clinic in Bracebridge, Ontario, Canada. Although she refused payments for her services, she accepted donations to help support her clinic. Nurse Caisse dedicated her life to using the Essiac formula.
In 1977, Nurse Caisse signed over all her rights to the original Essiac formula to Resperin Corporation Limited. Dr. Charles Brusch of Cambridge, Massachusetts, witnessed the signing of the agreement between Rene Caisse and Resperin attesting that her original herbal formula was never revealed to anyone other than to Resperin. To view the agreement, click here.