AD	Alzheimer’s Disease
AQP4	Aquaporin-4
BBB	Blood–Brain Barrier
BCS	Biopharmaceutics Classification System
CNS	Central Nervous System
COMT	Catechol-O-Methyltransferase
CSF	Cerebrospinal Fluid
FDA	Food and Drug Administration
GI	Gastrointestinal
HIF-1α	Hypoxia-Inducible Factor-1 Alpha
IL	Interleukin
ISF	Interstitial Fluid
LDL	Low-Density Lipoprotein
LLPS	Liquid–Liquid Phase Separation
LPS	Lipopolysaccharide
LCTs	Long-Chain Triglycerides
MAO-B	Monoamine Oxidase-B
MCTs	Medium-Chain Triglycerides
MDS-UPDRS	Movement Disorder Society–Unified Parkinson’s Disease Rating Scale
NF-κB	Nuclear Factor Kappa-B
PD	Parkinson’s Disease
PEG	Poly(Ethylene Glycol)
PINK1	PTEN-Induced Kinase 1
PLGA	Poly(Lactic-co-Glycolic Acid)
ROS	Reactive Oxygen Species
SCFAs	Short-Chain Fatty Acids
SNc	Substantia Nigra Pars Compacta
SNEDDS	Self-Nanoemulsifying Drug Delivery Systems
TLR	Toll-Like Receptor
TNF-α	Tumor Necrosis Factor-Alpha