Highlights One-step synthesis provides affordable, stable, and biocompatible nanoparticles. PEG-coated gold nanoparticles exhibited very low cytotoxicity effects. This in vivo study did not reveal hematopoietic, renal, or hepatic alterations. The histopathological analysis did not present any tissue or cellular damage. ABSTRACT Objective: To evaluate the in vitro and in vivo toxicities of polyethylene glycol-coated gold nanoparticles synthesized using a one-step process. Methods: Gold nanoparticles were prepared via a co-precipitation method using polyethylene glycol, and the synthesis product was characterized. For […]