| Product name | L-selenomethionine |
| Others name | (S)-(+)-2-Amino-4-(methylseleno)butanoic acid; L-selenomethionine |
| CAS No. | 3211-76-5 |
| Apperance | White to gray white Power |
| Specification | Selenomethionine 1.25%, Se 0.5% |
| Molecular Formula | C5H11NO2Se |
| Optical rotation | +17.0°- +19.5° |
| Shelf time | 2 years,keep away sunlight, keep dry |