Welcome to Heartland Assays, LLC

Heartland Assays Inc. is a joint venture between Dr. Ronald Horst, Ames, IA and Dr. Bruce Hollis, Charleston, SC. The main focus of Heartland Assays is to provide analytical services to research clientele and assist them in evaluating the Vitamin D and calcium status of their research subjects. Recently there has been an explosion of interest in the role of Vitamin D deficiency in the onset of many types of cancer and infectious diseases. Drs. Horst and Hollis have over 60 years combined experience in the development and application of Vitamin D (and other calcium regulating hormone) assays in human and veterinary medicine.

About Us

What We Do

Heartland Assays' mission is to provide analytical services for research and industry (and soon to be clinical) clientele, and help them assess and evaluate Vitamin D status. With cutting edge technology and over 60 years of combined experience, Heartland Assays has the knowledge, skills and expertise to provide a "one-stop shop" for all of your Vitamin D and Vitamin D related needs.