ANCOVA	Analysis of covariance
ART	Assisted reproductive technology
DHA	Docosahexaenoic acid
EFSA	European Food Safety Authority
GRADE	Grading of recommendations, assessment, development, and evaluation
IOM	Institute of Medicine
LAC	L-acetyl-carnitine
LC	L-carnitine
MD	Mean difference
OS	Oxidative stress
PICOTS	Population–intervention–comparison–outcome–ime–study design
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-analyses
Pseudo-IDP	Pseudo individual participant data
RCT	Randomized controlled trial
RoB2	Revised Cochrane risk of bias
ROS	Reactive oxygen species
RR	Risk ratio
SE	Standard errors
UL	Tolerable upper intake level
95%CI	95% confidence interval