| 1,25(OH)2D | calcitriol |
| 25(OH)D | calcidiol |
| 7-DHC | 7-dehydrocholesterol |
| ACC | anterior cingulate cortex |
| BBB | blood-brain barrier |
| BDNF | brain-derived neurotrophic factor |
| CRP | C-reactive protein |
| CYP27B1 | 25-hydroxyvitamin D-1 alpha hydroxylase |
| CYP2R1 | 25-hydroxylase |
| DBP | vitamin D binding protein |
| dlPFC | dorsolateral prefrontal cortex |
| HPA | hypothalamic–pituitary–adrenal |
| IDO | indoleamine 2,3-dioxygenase |
| IL | interleukin |
| KYN | kynurenine |
| LPS | lipopolysaccharide |
| MAO-A | monoamine oxidase-A |
| MDD | major depressive disorder |
| NF-κB | nuclear factor κB |
| NGF | nerve growth factor |
| NLR | neutrophile-to-lymphocyte ratio |
| NT | neurotrophin |
| QUIN | quinolinic acid |
| RCT | randomized clinical trials |
| RXR | retinoid X receptor |
| SAD | seasonal affective disorder |
| SERT | serotonin reuptake transporter |
| SSRI | selective serotonin reuptake inhibitors |
| TPH2 | tryptophan hydroxylase 2 |
| UVB | ultraviolet-B |
| VDR | vitamin D receptor |
| VDREs | vitamin D response elements |
| WBC | white blood cell count |
| WHO | World Health Organization |
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