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Vitamin transporters at the blood–brain barrier.
| Vitamin | MW | Polarity | Transporter | SLC |
|---|---|---|---|---|
| Thiamine (B1) | 265 | charged | THTR2 | 19A3 |
| Riboflavin (B2) | 376 | hydrophilic | RFVT2 | 52A2 |
| Niacin (B3) | 123 | carboxylate | MCT1 | 16A1 |
| Pantothenic acid (B5) | 219 | carboxylate | SMVT | 5A6 |
| Pyridoxine (B6) | 169 | hydrophobic | THTR2 | 19A3 |
| Biotin (B7, B8) | 244 | carboxylate | SMVT | 5A6 |
| Folic acid (B9, B11) | 441 | hydrophilic | FOLR1 | receptor |
| Cobalamin (B12) | 1355 | hydrophilic | TCBLR | receptor |
