Also called animal study · in-vivo · preclinical animal model
In vivo (Latin: "within the living") refers to experiments performed in whole living organisms. Animal (rodent) models come first; human clinical trials follow. In vivo data are considered stronger than in vitro because they reflect whole-system complexity — absorption, distribution, immune response, and off-target effects.
Research use only. This definition is an educational reference, not medical advice or dosing guidance.