Abstract: Thiol compounds are employed in conjunction with compounds which modulate self proliferation, both as to plants and mammals. The thiol compounds find effect in enhancing the effectiveness of auxin like compounds, either as herbicides or in enhancing root formation. In addition, thiol compounds act in conjunction with cytotoxic agents in mammals to allow for lower dosages of the cytotoxic agents while retaining the cytotoxic effect against hyperproliferative diseases, such as cancer. The combination finds particular effect against cells dependent upon an isoform of a surface membrane NADH oxidase for proliferation.