Also called phase 1 · phase 2 · phase 3 · trial phase
Clinical phases describe the staged structure of human trials: Phase 1 assesses safety and dosing, Phase 2 efficacy and side effects, Phase 3 confirmatory efficacy at scale, and Phase 4 post-approval surveillance. AmericanPeptide surfaces trial phases from ClinicalTrials.gov.
Research use only. This definition is an educational reference, not medical advice or dosing guidance.