The sutherlandia you are referring to is the plant Sutherlandia Frutescens, which only makes up 20% of the herbal supplement known as Sutherlandia OPC (the other 80% is oleander extract with the toxins removed).
There is a lot of woo and voodoo out there, but Sutherlandia OPC is the real deal. I am the moderator of a Yahoo health group "Oleandersoup", which has over 1300 members and is over five years old. Most members take the OPC as part of a suggested natural anti-cancer protocol. During the past five plus years, I am aware of only only three members who are not still alive: two came to the group with only weeks to live after chemo and radiation had virually destroyed their immune systems and major organs. Another took the OPC for less than two months and then listened to his oncologist tell him it was snake oil and nothing could save him from living for another two or three months maximum. He stopped taking the OPC and got a nerve block to ease his pain, and then proceeded to live over a year and a half longer.
One of the survivors is my 86 year old uncle. Traditional radiation failed to work and his lung cancer tumor continued to grow and spread to the rest of his body. He is now cancer free and enjoys a daily round of golf.
In South Africa, where Sutherlandia OPC has been vitually 100% successful in reversing the symptoms of HIV, hundreds of people have been treated with the OPC over the past five years. Thus far, only eight have failed to survive and most of the cancers are gone. Of the eight who did not surive, three began taking the OPC with scant days to live and another three succumbed to major organ failure as a likely result of prior chemo and/or radiation. I personally know the Naropathic PhD who devised the formula.
BTW, two different oleander based patented medicines are currently in FDA trials and the first of those, Anvirzel, has been used often as a CAM in cancer treatments by mainstream oncologists. It potentiates both chemo and radiation and either greatly lessens or eliminates virtually all known side effects of chemo.
For more information, see the "Oleander Series" of articles at:
http://www.tbyil.com/articles.htm