More calls today, both hanging up before I could even answer.
Decided to call back to find out who this was. Turns out that the hangup calls are a result of malfunctioning autodialing software. Immediately after explaining this and apologizing, the man on the other side launched into his script for selling "Brazilian Gold": "I understand that you are interested in better health etc. etc." "Well" I said "You don't understand that from me, and I don't know who you would have understood it from, and in any case I'm not interested". He pushed on, and I was forced to just hang up.
A little investigation found web pages that tie a "Brazilian Gold" to other non-FDA approved supplements that have been sold via telemarketers: Herbathin and Emagrece. The FDA issued a warning about these products, which you can find at http://www.fda.gov/Safety/MedWatch/SafetyInfo ... s/ucm152382.htm
Even if "Brazilian Gold" is not a new name for these destructive products, I highly recommend that you get your medicines from local legal sources, preferably under the supervision of your healthcare professionals. The people selling this stuff over the phone are *not* healthcare professionals, nor are they your friends, and they have no incentive to protect you from dangerous products (in fact just the opposite: they only make money by selling you this stuff and will use whatever psychotechinques known to them to do so!)
Also note: when I originally tried to call the number back to find out who it was, I dialed the "734" area code prefix; apparently since I am in the same area code, all I got was dead air. When I called the seven digit number alone (274-5099) I was immediately connected. FYI, in case you want to verify the number for yourself.