Available Studies Study # 50523 Rheumatoid Arthritis A Man or Woman , ages 18 - 70 years old. Compensation up to $3,800 This study will consist 2-day inhouse stay plus multiple returns See Details Sign Up Study # 51823 Smoker/Non-THC User Menthol and Non-Menthol Smokers , ages 22 - 65 years old. Compensation up to $4,000 This study will consist an outpatient visit, five-day at home product trial, followed by a six-day in-house stay is required. See Details Sign Up QPS has an almost constant supply of new and ongoing clinical research studies that are seeking healthy participants. Please check out the studies listed above to see if there is one that may be right for you. Please visit this page often as we add new clinical research studies on a weekly basis. To see more information about a particular study, please click on the “See Details” link at the bottom of each box. If you’ve already submitted an application and find a clinical research study that you would like to enroll in, please call to speak to a Recruiting Coordinator at 417-831-2048 between 8:00 a.m. – 5:00 p.m. Monday thru Friday. Signup to Pre-Qualify "*" indicates required fields Study # Name* First Last Email* PhoneBirth Date* MM slash DD slash YYYY CAPTCHANameThis field is for validation purposes and should be left unchanged. Δ CURRENT PARTICIPANT? If you are already participating in a trial and would like to review the details, please visit our ongoing studies page.