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Salvestrols are plant derived compounds (phytonutrients) essential for wellbeing that cannot be made in the body and must therefore be supplied through our diet. As a group, they are chemically unrelated substances except for the similar manner in which they confer their benefits, that is, as a result of their action with a particular enzyme. This enzyme is present only in malfunctioning cells and when it encounters a salvestrol it converts it into a form which is toxic to the sick cell. Because the enzyme is not present in healthy cells the Salvestrols exert no ill effects on them.