Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Levothyroxine, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Levothyroxine impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Levothyroxine-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.
Our Levothyroxine-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.
Levothyroxine Related Compounds
Stable Isotopes
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Levothyroxine- 13C6 | Stable Isotopes | CS-O-38573 | Not Available | Enquire |
| Levothyroxine- D5 | Stable Isotopes | CS-O-38575 | Not Available | Enquire |
| Levothyroxine-13C9-15N | Stable Isotopes | CS-O-03203 | 1431868-11-9 | Enquire |
| Levothyroxine-d3 | Stable Isotopes | CS-O-16186 | Not Available | In Stock |
API Standards
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Levothyroxine | API Standards | CS-BB-00023 | 51-48-9 | In Stock |
| Levothyroxine Sodium | API Standards | CS-O-01770 | 55-03-8 | In Stock |
| Levothyroxine Sodium Hydrate | API Standards | CS-O-16243 | 25416-65-3 | In Stock |
| Liothyronine sodium | API Standards | CS-O-30971 | 55-06-1 | In Stock |
| Thyroxine Sodium | API Standards | CS-O-02455 | 55-03-8 | In Stock |
Metabolites
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Levothyroxine N-Methylamide | Metabolites | CS-O-14502 | 2088032-52-2 | In Stock |
Impurities
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| *Levothyroxine | Impurities | CS-T-44338 | 32180-11-3 | In Stock |
| 3'-Bromo-3,5,5'-triiodothyronine | Impurities | CS-O-45711 | 77667-01-7 | Enquire |
| Levothyroxine - Impurity G | Impurities | CS-O-39515 | Not Available | Enquire |
| levothyroxine Dimer | Impurities | CS-O-45712 | 2088032-62-4 | Enquire |
| Levothyroxine Dimer 2 | Impurities | CS-O-34272 | 1425050-65-2 (Racemic) | In Stock |
| Levothyroxine dimer-1 | Impurities | CS-O-34262 | 2086257-72-7 (Racemic) | In Stock |
| Levothyroxine EP Impurity B | Impurities | CS-O-15811 | 1628720-66-0 | In Stock |
| Levothyroxine EP Impurity C | Impurities | CS-T-45488 | 51-24-1 | In Stock |
| Levothyroxine EP Impurity D | Impurities | CS-T-43890 | 67-30-1 | In Stock |
| Levothyroxine EP Impurity E | Impurities | CS-T-19369 | 1041-01-6 | In Stock |
| Levothyroxine EP Impurity F | Impurities | CS-T-62058 | 911661-90-0 | In Stock |
| Levothyroxine EP Impurity G Hydrochloride | Impurities | CS-O-33624 | 2230724-39-5 (Freebase) | In Stock |
| Levothyroxine EP Impurity H | Impurities | CS-T-43894 | 2055-97-2 | In Stock |
| Levothyroxine EP Impurity I | Impurities | CS-T-43892 | 2016-06-0 | In Stock |
| Levothyroxine EP Impurity K | Impurities | CS-O-14067 | 5817-39-0 | In Stock |
| Levothyroxine Ethyl Ester | Impurities | CS-T-44337 | 76353-71-4 | In Stock |
| Levothyroxine Impurity 30 Sodium Salt | Impurities | CS-P-08125 | Not Available | Enquire |
| Levothyroxine- Impurity 5 | Impurities | CS-DN-00016 | Not Available | Enquire |
| Levothyroxine Lactose Adduct | Impurities | CS-P-08082 | Not Available | In Stock |
| Levothyroxine Lactose Adduct (N-lactoside) | Impurities | CS-O-35442 | Not Available | Enquire |
| Levothyroxine Lactose Adduct (O-lactoside) | Impurities | CS-O-35443 | Not Available | Enquire |
| Levothyroxine Monochloro Impurity | Impurities | CS-O-16035 | 909279-46-5 | In Stock |
| Levothyroxine N- formamide Impurity | Impurities | CS-DN-00017 | Not Available | Enquire |
| Levothyroxine Related Compound 10 | Impurities | CS-P-08124 | 94345-95-6 | In Stock |
| Levothyroxine Sodium EP Impurity J | Impurities | CS-I-00089 | 70-40-6 | In Stock |
| Levothyroxine stearic acid impurity 1 | Impurities | CS-O-53552 | Not Available | Enquire |
| Levothyroxine stearic acid impurity 2 | Impurities | CS-O-53553 | Not Available | Enquire |
| Levothyroxine-4-Lactose Maillard Impurity | Impurities | CS-O-50307 | Not Available | Enquire |
| Levothyroxine-alpha-hydroxymethy-impurity | Impurities | CS-O-34260 | 2086257-60-3 | In Stock |
| O-(4-Hydroxy-3-iodophenyl) Levothyroxine | Impurities | CS-EO-03977 | Not Available | Enquire |
| TRIIODO-L-THYRONINE AMPOLA 100 µG/ML | Impurities | CS-O-48172 | 5817-39-0 | Enquire |
EP Standards
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Levothyroxine for peak identification (Y0001382) | EP Standards | CS-EG-01445 | 25416-65-3 | Enquire |
Intermediates
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 4-Hydroxy-3-iodo-5-nitrobenzaldehyde | Intermediates | CS-O-40713 | 3861-58-3 | Enquire |
Glucuronides
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Levothyroxine Mannitol Adduct | Glucuronides | CS-O-53867 | Not Available | Enquire |