In 1921, Guy Hollister, a chemist, and Dr. Robert Stier, a pathologist, developed a treatment to bring relief to the allergy ... suffering in their own families. From those beginnings a company dedicated to putting an end to allergy suffering was born, HollisterStier Allergy. Over the years that focus has not wavered, and our quest for better ways to do things continues. We take pride in the quality of our extracts, and our research and development group continually looks at ways to improve them. Our constant search for better ways to do things and an overwhelming need to help allergy sufferers get more out of life have led us to some unique products like our multiple skin test devices, and our phenol free antigens. And we are working on all kinds of other great new ideas. read more