Salvestrols

Salvestrols are a new class of natural anticancer chemicals, which are found in plants and safely eaten in the diet*. Initially non-toxic to the body’s normal cells, Salvestrols become activated inside human cancer cells by an enzyme, CYP1B1 (pronounced “sip one bee one”). The activated Salvestrols then cause the cancer cells to stop growing or die, without harming normal cells. This specificity of action is possible because CYP1B1 is an intrinsic component of cancer cells and occurs in all of the wide range of different types of cancer that have been studied to date, but is absent from normal cells.

* blackcurrant, blueberry, strawberry, and tangerine peel have been used as the basis of commercial products.

“ A 2007 BBC News story reported on a laboratory study that had found salvestrols extracted from tangerine peel show anti-cancer effects… on cells ..in the laboratory”

“Enthusiasm for resveratrol, the first salvestrol discovered, decreased substantially with additional scientific investigation. A large clinical trial of a resveratrol-based pharmaceutical, SRT-501, was halted when it showed no anti-cancer activity and had significant side effects… … In a 2013 Royal Society of Chemistry podcast, Philip Broadwith stated that “despite the lack of reliable data on resveratrol's effects in humans, the compound is still marketed as a dietary health supplement”

from wikipedia