Within the types segment, the Teriflunomide API market is classified by purity grade and production scale. Pharmaceutical‑grade API—meeting stringent USP or EP specifications—captures the majority of commercial sales, as it is required for final drug product formulation and is subject to rigorous regulatory oversight. Bulk‑synthesis API, produced in larger volumes with slightly broader impurity limits, serves intermediate manufacturers and is often sourced for cost‑sensitive markets, representing a smaller but strategically important niche. A third category, custom‑synthesis API, is tailored for clinical‑trial batches or specialty formulations, characterized by flexible batch sizes and bespoke impurity profiles; this segment, while limited in volume, commands higher margins due to its specialized nature. The relative contributions of these type sub‑segments determine capacity allocation across manufacturing sites and influence the overall market valuation, as each tier aligns with distinct supply‑chain requirements and pricing structures.