Cypress Systems

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Cypress Systems, Inc. is a biotech company headquartered in Madera, California and is best known for its research, in collaboration with the National Cancer Institute (NCI), regarding the use of selenium supplementation for the prevention of a variety of cancers.[1] Cypress Systems, Inc. also manufactures selenium, zinc, and chromium for the nutraceutical industry.

In 1983, the now-deceased Dr. Larry C. Clark conducted a Nutritional Prevention of Cancer (NPC) study. This historic trial claimed that selenium supplementation prevented a variety of cancers,[1] a claim which has not been validated by later enquiry, as there is no good evidence selenium supplementation helps prevent cancer.[2]

Since 2008 the Chief Operating Officer (COO) of Cypress has been Mark Whitacre. In the 1990s, while working at Archer Daniels Midland, Whitacre became the highest level executive of a Fortune 500 company in US history to turn whistleblower.[3]


  1. ^ a b Effects of selenium supplementation for cancer pre...[JAMA. 1996] - PubMed Result
  2. ^ Dennert G, Zwahlen M, Brinkman M, Vinceti M, Zeegers MP, Horneber M (2011). "Selenium for preventing cancer". Cochrane Database Syst Rev (5): CD005195. doi:10.1002/14651858.CD005195.pub2. PMC 3692366Freely accessible. PMID 21563143. 
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