Custom Antibody Services

Not all antibodies are created equal. The way your custom antibodies are produced can make all the difference to your success. At Fortis, we are 100% vertically integrated from antigen to antibody, giving us complete supply chain control. We manage the entire production and quality control process from start to finish at our in-house facility to provide you with high levels of project customization and scalability. This comprehensive service gives our customers peace of mind and confidence in our products.


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Our Approach

Medical Research Scientists Have a Conversation While Conducting Experiments

The best antibodies start with the best antigens

Our robust process means we have complete control over antibody design and full QC oversight. We also make our own recombinant protein antigens, so we can target specific proteins and protein forms that are often not commercially available.

Customer-led project progression

Here at Fortis, we believe you should retain complete control over your project at all stages of the antibody development process. We pride ourselves on our flexibility and adapt our process to your specific project, not the other way around. You validate each milestone’s deliverables, and we only move forward toward the next goalpost when you are completely satisfied with the progress.

We de-risk your journey

We take your objectives as our goals and work with you to define clear milestones. These milestones are heavily weighted to achieve a successful finished project, ensuring turnkey use in your applications and de-risking your process.


Personalized solutions tailored to your needs

At Fortis, we closely collaborate with you to develop the antibody-based toolbox you require and adapt our processes to your workflow. Choose from various custom antibody solutions and easily transition from polyclonal to recombinant monoclonal antibody development, if desired.

We care about your success

Your scientific discovery, business, and reputation are too vital for us to cut corners. Our dedicated scientists are passionate problem solvers, and we make every effort to ensure your project succeeds on time and within budget.

A rich knowledge base

Our scientists have decades of experience in biotechnology and pharmaceutical developments and invest the time to understand your exact needs. Our lab is your lab, and the technical team is always on hand to share its expertise with you every step of the way.


Our Custom Antibody Services

Custom Monoclonal Antibodies


Custom Polyclonal Antibodies


Custom Single-Domain Antibody Discovery Services


Antibody Conjugation


Bulk Antisera



Learn how our customers are leveraging custom antibody services:

Michael-Christopher Keogh, PhD
Chief Scientific Officer
EpiCypher Inc.


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Lori Kobayashi
Project Manager
Valted Seq


Read more

Bijan Etemad-Gilbertson, PhD
Head of Antibody Technology
NextPoint Therapeutics


Read more

Submit your custom antibody request:


The Fortis Life Sciences Difference

  • High Quality Products
  • Leading Technical Support
  • One-day Shipping on 95% of Products

Fortis is dedicated to supporting scientific discovery through its qualified antibody products and custom antibody service, and serves to advance science by developing qualified antibodies for emerging and underserved protein targets.

Our portfolio consists of over 9,500 catalog products, offering over 8,000 primary antibodies, targeting over 3,000 proteins and 1,000 secondary antibodies raised against immunoglobulins from over 25 species.

Bethyl Laboratories has been a provider of qualified antibody products and custom services since it was founded in 1972. Bethyl Laboratories is now part of Fortis Life Sciences. Learn more here.

Fortis is committed to the welfare of animals as reflected by the company’s core values. As a USDA-registered research facility, our practices strictly adhere to the Animal Welfare Act.

USDA Class R Research Facility Registration #74-R-0044
PHS/NIH/OLAW Animal Welfare #A3991-01