Angel Valley Farm produces only certified organic Shiitake Products. We are certified by an independent certification group called "Scientific Certification Systems" http://www.scscertified.com/foodAgriculture/foodag_organiccert.html. -SCS is a USDA accredited organic certifier using the name Nutri-Clean This guarantees you that our Shiitake mushrooms are grown naturally and organically by the standards set forth by the U.S.D.A and guaranteed by S.C.S Home | Commercial Orders | Shiitake Growing Process | Certified Organic | Food Alliance Approved| Comments| Customers| Contact Us For problems with this web site, please contact webmaster@angelvalleyfarm.com