Types segmentation reveals methodological distinctions in cytotoxicity testing. In vitro assays (e.g., MTT, LDH release) constitute the largest share (~60% of 2023 revenue) due to their cost-efficiency, scalability, and ethical advantages over animal models. In vivo assays, though declining in adoption, remain indispensable for regulatory validation in complex therapies like cell-based treatments or implantable devices. Hybrid approaches, such as 3D cell culture models and organ-on-a-chip technologies, are emerging as niche sub-segments, driven by advancements in tissue engineering. The market taxonomy for types reflects a strategic shift toward high-throughput, automation-compatible in vitro methods, supported by AI-driven data analytics. This evolution underscores the balance between traditional validation needs and innovation in testing methodologies.