My MIL is getting some, recommended by her doctor so I googled it and found this...apparently it's a fairly new thing in north america but it's been used in Germany for over 40 yrs.... I'm gonna try some too.
here's the link, if it doesn't work, copy and paste it into your search engine.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12618546&dopt=Abstract