ADP	adenosine diphosphate
AMP	adenosine monophosphate
ATP	adenosine triphosphate
cADPR	cyclic ADP ribose
CYP	cytochrome P450
ECM	extracellular matrix
GSH	glutathione
GSSG	glutathione disulfide
IL	interleukin
MAPK	mitogen-activated protein kinase
MASI	melasma area and severity index
MMP	matrix metalloproteinase
NaAD +	nicotinic acid adenine dinucleotide
NaADP +	nicotinic acid adenine dinucleotide phosphate
NAD +	nicotinamide adenine dinucleotide
NADH	reduced nicotinamide adenine dinucleotide
NADP +	nicotinamide adenine dinucleotide phosphate
NADPH	reduced nicotinamide adenine dinucleotide phosphate
NaMN	nicotinic acid mononucleotide
NAMPT	nicotinamide phosphoribosyltransferase
NF-κB	nuclear factor-κB
NMN	nicotinamide mononucleotide
NNT	nicotinamide nucleotide transhydrogenase
PAR-2	protease-activated receptor-2
PARP	poly(ADP-ribose) polymerase
PG	prostaglandin
PM	particulate matter
PPi	inorganic pyrophosphate
PRPP	phosphoribosyl pyrophosphate
ROS	reactive oxygen species
sir2	silent information regulator-2
SIRT1	sirtruin1
SPF	sun protection factor
TGF-β	transforming growth factor-β
TNF-α	tumor necrosis factor-α
UV	ultraviolet