Thymalin Research Phase Thymalin (Thymic Polypeptide Complex) Category Immune & Inflammatory AliasesThymaline, TP-1 AdministrationIntramuscular injection OverviewHow it worksTimingBenefitsSide effectsResearchSources Research and regulatory 📋 Development stage Studied in Russian clinical research since the 1970s-80s for immune restoration; not FDA reviewed. ⚖️ Legal and regulatory Approved prescription drug in Russia; not FDA approved or reviewed in the United States. ⚠️ Side effects Generally well-tolerated in Russian clinical studies