This is an email I received back from the head researcher regarding mustard seed powder.
Dear Mr Moon,
Thank you for your interest in this work. The mustard seed powder used in this paper was purchased from Spice House (Chicago, IL), the one called hot oriental mustard seed powder. This powder had the highest level of the active ingredient, compared with several other powders purchased from other companies. But I must say that our experience has been that these products vary greatly from batch to batch. So, it will be difficult to know if you are buying a good one or not. More importantly, as exciting as this new study may sound, there is currently no information as to if such a powder works against bladder cancer in humans, how much and how frequently one should take it, whether there is any adverse consequence associated with taking it, or if taking it will interfere with other treatments the patient is receiving... The dose that worked in the animals, however, was pretty low, about 70 mg powder per kg body weight, but we all know that dose extrapolation from animal to human is not easy.
Our next step is to standardize the powder preparation and test such powder in humans against bladder cancer, but this will take some time. This is frustratingly slow for patients and for us as well. I'm sorry that I cannot be of more help.
Sincerely,
Yuesheng Zhang.
Roswell Park Cancer Institute
Buffalo, New York