ABP	Androgen-binding protein
Akt	Protein kinase B
BMI	Body mass index
BW	Body weight
CRP	C-reactive protein
FM	Fat mass
FSH	Follicle-stimulating hormone
GH	Growth hormone
GLP-1	Glucagon-like peptide-1
GLUT-4	Glucose transporter-4
GnRH	Gonadotropin-releasing hormone
GPx	Glutathione peroxidase
hCG	Human chorionic gonadotropin
HDL	High-density lipoprotein
HOMA-IR	Homeostatic Model Assessment of Insulin Resistance
HPT	Hypothalamus–pituitary–testicular
IGF-1	Insulin-like growth factor-1
IL-1β	Interleukin-1 beta
IL-6	Interleukin-6
IRS	Insulin receptor substrate
JNK	c-Jun N-terminal kinase
LDL	Low-density lipoprotein
LH	Luteinizing hormone
LOH	Late-onset hypogonadism
MA	Meta-analysis
MAPK	Mitogen-Activated Protein Kinase
MDA	Malondialdehyde
NAC	N-acetylcysteine
NAFLD	Nonalcoholic fatty liver disease
NO	Nitric oxide
NOS	Nitric oxide synthase
PI3K	Phosphatidylinositol 3-kinase
RNS	Reactive nitrogen species
ROS	Reactive oxygen species
SBP	Systolic blood pressure
SOD	Superoxide dismutase
SR	Systematic review
StAR	Steroidogenic acute regulatory protein
T2DM	Type 2 diabetes mellitus
TC	Total cholesterol
TG	Triglyceride
TNF-α	Tumor necrosis factor-alpha
TRT	Testosterone replacement therapy
WC	Waist circumference