R&D Systems has supplied life science researchers with proteins, antibodies, immunoassays, and cell-culture tools for decades and is now part of Bio-Techne. The brand is particularly well known for cytokines, growth factors, ELISA kits, and reagents used in immunology, stem cell, cancer, and neuroscience research. Extensive quality testing and lot-specific documentation support experiments where biological activity, specificity, and consistency directly affect reproducibility.

