From the “World Without Cancer” website: Vitamin B17 and Sickle Cell Anemia : The successful use of cyanates in the control of sickle cell crisis has been indicated clinically and experimentally. Thiocyanate, an intermediate product of the metabolism of Vitamin B17 is thought to be the active component. The recommended daily supplementation of Vitamin B17 is 50 to 100 m.g. for small children and 250 to 500 m.g. per day for the adult sickler.