PSYCHOLOGIX® has conducted studies involving many tens of thousands of patients during the past nineteen years. Multinational companies sponsoring these studies include:
 
Bayer
Bristol-Myers Squibb
Eli Lilly and Company
Fidia (Italy)
GlaxoSmithKline
General Nutirition Centers
Johnson and Johnson
Lucas Meyer (Germany)
Merck & Company
Otsuka (Japan)
Pfizer
Sention
UCB (Belgium)
Wyeth