| TESTING ITEMS | SPECIFICATIONS | RESULTS |
| Appearance | Yellow crystalline powder | Confirms |
| Identification | Meets the requirements | Confirms |
| Melting point | 48.0℃~51.0℃ | 49.3℃ |
| Optical rotation | +110.0°~+120.0° | +111.0° |
| Loss on drying | ≤0.50% | 0.07% |
| Heavy metals | ≤10ppm | <10ppm |
| Assay(R-Alpha Lipoic Acid) | ≥98.0% | 98.10% |
| Assay(On dried basis) | ≥99.0% | 99.60% |
| Conclusion: The Product Conforms to USP. |
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