SNHL	Sensorineural hearing loss
NS	Nigella sativa
TQ	Thymoquinone
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-analyses
SYRCLE	Systematic Review Center for Laboratory Animal Experiments
ROS	Reactive oxygen species
NIHL	Noise-induced hearing loss
AIHL	Age-related hearing loss
ABR	Auditory brainstem response
DPOAE	Distortion product otoacoustic emission
PTA	Pure-tone audiometry
RCT	Randomized controlled trial
NSO	Nigella sativa oil