Pel-Freez is a trusted supplier of human and animal biological materials for pharmaceutical and CRO teams worldwide. Whether you're developing assays, qualifying safety tests, or modeling immune responses, we support your work from discovery to development.
Key applications we support
Assay qualification
Our baby rabbit complement and other biological reagents are widely used in complement-dependent cytotoxicity (CDC), neutralization assays, and other functional tests that support regulatory submissions.
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Immunogenicity assays
Pel-Freez reagents—including normal human serum (ADHS) and antibody-depleted human serum (ADHS/ADHC)—are used by leading vaccine research teams for SBA, OPKA, and other assays to evaluate immunogenicity.
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Diagnostic and serological assay development
Build, test, and optimize new assays with well-characterized biological materials from multiple species, often used as a protein purification source or assay component.
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Cell culture
Pel-Freez offers stocked and custom products for use as cell culture media or to supplement cell culture. Our high-quality products promote consistent cell growth and viability across biopharmaceutical applications including drug screening, transfection, and immune cell expansion.
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Antibody-based applications
Our catalog includes blocking sera, diluents, tissues, whole organs, and antibodies to support a wide range of antibody-based applications, including ELISA, western blot, IP, IHC, and IF. From staining to protein detection, Pel-Freez delivers the biological reagents researchers need in one convenient place.
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Custom bioprocessing services
Need help with lyophilization, tissue procurement, extractions, protein purification, or another custom project? Our team of biological manufacturing specialists is here to support you—backed by stringent QC, proven processes, specialized equipment, and a passion for getting the science right.
Built for high-stakes science
Trusted by leading drug discovery, vaccine development, and medical research teams, our products support the rigorous demands of pre-clinical and commercial workflows.
What researchers say about Pel-Freez
“Pel-Freez is our go-to provider of essential reagents such as Lyophilized Rabbit complement and immunoglobulin-depleted human serum. These quality products allow us to perform our in-house opsonophagocytic killing assay (OPK/OPA) and move rapidly on product development.”
“Pel-Freez is our first choice as a supplier for biological matrices and complement. Their product quality and consistency of product lot to lot enables us to develop premier bacterial assays in support of the world's premier vaccine biopharmaceutical companies with confidence.”
Frequently Asked Questions
May I receive a sample of your products? Will you hold a reserve of the product while I complete my testing?
Yes! We understand our products are used in a variety of applications and testing is often required to ensure acceptability. We are happy to provide samples and hold reserves up to 30 days. While we often have multiple inquiries for each lot of our products, we do our best to fulfill all customer requests.
What’s the maximum lot size of animal blood products I can order?
Our typical animal blood product lot sizes range from 50 L to 200 L.
Can I order products from a single lot? Can I order products from several different lots?
Yes, you can request products that originate from a single lot or from several different lots. We are usually able to accommodate these requests but availability may vary due to maximum lot volumes for certain products. We try to maintain a minimum inventory of ten 5+ liter baby rabbit complement (BRC) lots at all times so that customers have options to select from.
We recommend that you contact us directly with your request on our contact page or by emailing biosales@pel-freez.com.
How is Pel-Freez Biologicals’ antibody-depleted complement made?
We have developed a proprietary process for antibody removal based on affinity chromatography. Our method results in low residual antibody (<3% vs. feed serum) while maintaining high complement potency.
