Soursop is the fruit of Annona muricata, a broadleaf, flowering, evergreen tree. The exact origin is unknown; it is native to the tropical regions of the Americas and is widely propagated. It is in the same genus, Annona, as cherimoya and is in the Annonaceae family. This would-be health advisory informs recipients about the supposedly miraculous cancer killing powers of soursop, the fruit of the Graviola tree.

According to the message, soursop is a natural cancer killer that has been proven to be a whopping 10000 times stronger than chemotherapy in treating cancers. The message also claims that, although drug companies are aware of the graviola's amazing cancer fighting properties, they have chosen not to release the information to the public or pursue further research because they will not be able to make any money out of it. The message claims that, since the graviola tree is 'all natural', it is not patentable and drug companies therefore cannot make profits from it.