| 25-OH Vit.D | 25-Hydroxyvitamin D |
| 7-DHC | 7-Dehydrocholesterol |
| CYP | Cytochrome P450 Enzyme |
| GH | Growth Hormone |
| MS | Multiple Sclerosis |
| PTH | Parathyroid Hormone |
| RA | Rheumatoid Arthritis |
| RXR | Retinoid X Receptor |
| SNP | Single-Nucleotide Polymorphism |
| VDDR1 | Vitamin D-Dependent Rickets Type 1 |
| VDR | Vitamin D Receptor |
| VDRE | Vitamin D Response Element |
| Vit.D | Vitamin D |