The olive leaf extract silver nanoparticles may be synthesized by extracting olive leaves and using the extract to synthesize AgNPs. Olive leaves may be washed, dried, and ground to a powder. The olive leaf powder may be mixed with a first solvent to form a first olive leaf extract. The first olive leaf extract may then be separated and/or concentrated by centrifugation and filtration to form a filtrate. The filtrate may be evaporated to form a residue. The residue may then be resuspended in ethanol to form a second olive leaf extract. The second olive leaf extract may be mixed with AgNO3 to form a mixture including the AgNPs.