Hello Mrree

The moderators asked me if I'd look into this for you.  I have had a look round and there is a small amount of published literature on this product, but most of the studies so far have been in animals or in cells in the lab.  The ones in people have been in small numbers of people and across a limited number of cancers.  So on balance I think it's fair to say that from a medical perspective there is not enough evidence to recommend its use. I would definitely talk to your father in law's doctor before he decides whether he wants to take it.  Also with diet supplements there may be  interactions with other medicines he might be taking now and in the future which are are not yet known about.

I hope that helps

Martin