A Complete Directory of 503B Pharmacies in California

California is home to the largest healthcare market in the United States, with a population of nearly 40 million people and world-renowned medical institutions spanning from Los Angeles to the San Francisco Bay Area. With major hospital systems, academic medical centers, and specialty clinics throughout the state, the demand for reliable, high-quality compounded medications is immense. For hospitals, clinics, and physician practices across California, 503B outsourcing facilities provide a critical supply of sterile and non-sterile compounded drugs produced under FDA oversight and Current Good Manufacturing Practices (cGMP).

This page provides a comprehensive, up-to-date directory of all FDA-registered 503B outsourcing facilities located in California. Each facility listed below is registered with the FDA and subject to federal inspection standards.

Official List of FDA-Registered 503B Facilities in California

Why Partner with a California-Based 503B Facility?

For hospitals, clinics, and health systems operating in California, sourcing compounded medications from an in-state 503B outsourcing facility offers several key advantages:

• Logistical Efficiency: Shorter shipping distances mean faster delivery times and reduced shipping costs, especially for temperature-sensitive sterile preparations that require cold-chain management. With facilities spread across Southern California and the Bay Area, most hospitals in the state can receive deliveries within one business day.
• Regional Expertise: California-based facilities understand the unique needs of the state's healthcare market, including the high-volume demands of major systems like Kaiser Permanente, Cedars-Sinai, UCLA Health, and Stanford Health Care.
• Simplified Audits: Many healthcare systems conduct on-site vendor audits before adding a 503B facility to their approved supplier list. Partnering with a local facility makes these audits more practical and cost-effective, without requiring expensive out-of-state travel.
• Supporting the Local Economy: Partnering with California-based compounding facilities keeps healthcare dollars within the state and supports the growth of the local pharmaceutical manufacturing sector.

California's Healthcare Market and 503B Demand

California's healthcare landscape is uniquely positioned to drive significant demand for 503B outsourcing services. As the most populous state in the nation, California is home to more than 400 hospitals, thousands of outpatient clinics, and some of the most prestigious academic medical centers in the world. The state's diverse patient population and expansive geographic footprint—stretching from the Mexican border to the Oregon state line—create complex supply chain challenges that 503B outsourcing facilities are well-equipped to address.

The state has also been at the forefront of healthcare innovation, with a strong biotech presence in the San Francisco Bay Area and San Diego. This culture of pharmaceutical innovation extends to compounding, where California facilities serve not only in-state providers but also ship to healthcare partners across the western United States.

California's large managed care market, led by organizations like Kaiser Permanente and Blue Shield of California, creates demand for standardized, high-quality compounded preparations that can be delivered at scale—exactly the type of service that 503B outsourcing facilities are designed to provide.

Navigating Compounding Regulations in California

503B outsourcing facilities in California operate under a dual regulatory framework. At the federal level, they are overseen by the FDA and must comply with Current Good Manufacturing Practices (cGMP). At the state level, they must also maintain licensure and good standing with the California State Board of Pharmacy.

The California State Board of Pharmacy oversees all pharmacy operations in the state, including licensing, inspections, and enforcement of state pharmacy laws. California has some of the most stringent pharmacy regulations in the country, and 503B facilities operating in the state must meet both federal cGMP requirements and California-specific standards for pharmacy operations, pharmacist oversight, and record-keeping.

Notably, California was among the first states to implement enhanced oversight of compounding pharmacies following the 2012 New England Compounding Center (NECC) meningitis outbreak, which helped shape the federal Drug Quality and Security Act (DQSA) that created the 503B outsourcing facility category. Healthcare providers in California should verify that any 503B facility they partner with is both FDA-registered and in good standing with the California State Board of Pharmacy. For more on the differences between federal and state oversight of compounding pharmacies, see our guide to 503A vs. 503B pharmacies.

Find a 503B Pharmacy Near You

New to 503B outsourcing facilities? Read our comprehensive guide: What is a 503B Pharmacy? Or learn about the key differences between traditional compounding and outsourcing facilities in our 503A vs. 503B comparison guide.