Shenzhen Asiatop Carnitine Technology Co., Ltd.
Specialty manufacturer of carnitine derivatives for use in formulations, based in Baoan, China.
http://www.asiatop-carnitine.com/

Wuxi Xilong Chemical Plant
tartrate.com
http://www.tartrate.com/

Lonza
Lonza is a life sciences driven company and leading custom manufacturer of active ingredients, intermediates, APIs and biopharmaceuticals based on exclusive chemical synthesis and biotechnology, microbial fermentation and mammalian cell culture.
http://www.lonzabiotec.com/

American Tartaric Products
Offers a variety of food and beverage additives including cream of tartar, tartrates, fining agents, yeast, enzymes, and antioxidants. Product details, MSDS sheets, and contact link.
http://www.americantartaric.com/