A validated RP-HPLC method for semaglutide and liraglutide on NanoPak-C all-carbon microbeads demonstrates R² > 0.99 linearity, LOD as low as 0.0024 mg/mL, and system precision below 2% %RSD — all at pH 8.5. We explain what each validation parameter means for QC labs, why liraglutide data extends the platform, and how this ICH Q2(R1)-compliant method is ready for regulatory submissions and multi-site method transfer.