USP (United States Pharmacopeia)   Corporate Headquarters   12601 Twinbrook Parkway   Rockville, Maryland 20852–1790, USA   Phone: 1–800–227–8772               1–301–881–0666   00 800 4875 5555   Web Site:  www.usp.org   Contact:  Chris Hall                  Email:  ch@usp.org                  Phone: 301-816-8198