Chemigran’s Resource Hub brings together clear, practical explainers on the core concepts behind sourcing pharmaceutical Active Pharmaceutical Ingredients (APIs), Reference Listed Drugs (RLDs), comparator drugs, and reference standards — the four pillars of what we supply. Use these guides to understand what you’re sourcing and why it matters before you buy.
Active Pharmaceutical Ingredients (APIs)
What Is an API (Active Pharmaceutical Ingredient)? — the biologically active component of a drug product, and what to check before qualifying a supplier.
Browse our API, RLD & Intermediates catalog.
Reference Listed Drugs (RLDs)
What Is a Reference Listed Drug (RLD) and Why Sourcing It Right Matters — the FDA-designated benchmark product used in bioequivalence and ANDA submissions.
Browse our Reference Listed Drug catalog.
Comparator Drugs
What Is a Comparator Drug? — the broader category of reference products used across clinical trials and international regulatory contexts.
Reference Standards
What Is a Reference Standard? — the characterized materials, including reference antibodies, used to verify identity, purity, and potency in analytical testing.
Need Help Sourcing?
If you’re not sure which category applies to your project, or need help qualifying a supplier, contact our team — we work with regulatory affairs, procurement, and R&D teams every day on exactly these sourcing decisions.
