ChromaDex ^*

Supplier of botanical reference standards along with related phytochemical products services.

http://www.chromadex.com/

LGC Promochem ^*

LGC Promochem is Europe’s most comprehensive source of reference materials.

http://www.lgcpromochem.com/home/home_en.aspx

 
National Institutue of Standards and Technology (NIST) ^*

NIST supplies industry, academia, government, and other users with over 1100 reference materials of the highest quality and metrological value.

http://www.nist.gov/

National Research Institute for CRM

The sole officially recognised Certificated Reference Material produced from China
http://inms-ienm.nrc-cnrc.gc.ca/en/main_e.php

National Water Research Institute (NWRI) ^*

Providing Certified Reference Materials and QA services for water and sediment trace elements.
http://www.nwri.ca/