California has 6,389 paid clinical trials enrolling now across cities including Los Angeles, San Francisco and San Diego. Search by condition, age, or phase to find compensated research studies accepting participants near you.
Research sites in California include Stanford Medicine, UCLA Health and UCSF, running studies across oncology, cardiology, neurology, and more. The most actively recruiting conditions are Breast Cancer, Prostate Cancer, Obesity, Colorectal Cancer — browse the full list or use the filters to match your diagnosis. Both patients and healthy volunteers may qualify. Most studies offer compensation for time and travel.
Recruiting trial data synced daily from ClinicalTrials.gov. Last sync: .
Posted to ClinicalTrials.gov within the last 60 days — these studies are just starting to recruit.
California has approximately 6,389 recruiting research studies across a wide range of therapeutic areas. California hosts a dense network of world-class research institutions, including UC San Diego Health, Stanford Medicine, UCLA Health, UCSF, City of Hope, and Scripps Research. The state's thriving biotech corridor and diverse patient population make it a national hub for both early-phase and late-phase clinical research.
Clinical trials in California are governed by U.S. Food and Drug Administration (FDA) regulations, Office for Human Research Protections (OHRP) standards, and federal HIPAA privacy rules. Every study is reviewed by an Institutional Review Board (IRB) to protect participant safety and ensure informed consent. In addition, California-specific protections such as the California Consumer Privacy Act (CCPA) and the Confidentiality of Medical Information Act (CMIA) impose stringent data-privacy requirements on research involving California residents.
Hipa.ai aggregates every recruiting study in California from ClinicalTrials.gov and refreshes the list daily. Use the filters above to narrow by condition, facility, age, phase, or healthy-volunteer eligibility, then click any study title to view full details — eligibility criteria, intervention, location, and sponsor contact information. To enroll, reach out to the central study contact listed on the study detail page; the research coordinator will walk you through the screening process.
There are approximately 6,389 recruiting clinical trials in California listed on ClinicalTrials.gov. The number changes weekly as new studies open and others close enrollment.
Most recruiting trials in California compensate participants for their time, travel, and study visits. Compensation varies by sponsor, study phase, and visit requirements — the exact amount is disclosed by the study team during the informed consent process.
Eligibility depends on the specific study. Each trial defines its own inclusion criteria (age, diagnosis, medical history, prior treatments) and exclusion criteria. Both patients with specific conditions and healthy volunteers can qualify, depending on the study design.
The most common conditions under active study in California include Breast Cancer (102), Prostate Cancer (85), Obesity (71), Colorectal Cancer (65), among many others. Browse the list above to explore every recruiting trial.
Yes. Healthy-volunteer studies — often early-phase pharmacology or vaccine trials — recruit in California on an ongoing basis. Use the "Healthy volunteers only" filter above to view trials that accept participants without the study's target condition.
Click any study title above to see the full study record, including eligibility criteria, visit schedule, and the study team's contact information. Reach out to the central contact or recruiting site directly — they will guide you through screening and informed consent.