T4
Levothyroxine. Loti Labs supplies it as a 400 mcg/mL research liquid in 30 mL bottles, for laboratory research.
Specifications
Reference dataFormula, molecular weight and CAS number are reference values for the compound, not measurements of a specific batch.
- Compound
- Levothyroxine (T4)
- Class
- Levothyroxine
- Molecular formula
- C15H11I4NO4
- Physical presentation
- Research liquid, 30 mL bottle
- Formats
- 400 mcg/mL liquid, 30 mL
Current certificates of analysis
TipMatch the batch number on your bottle label to the certificate. Click any certificate to open it full size.
400 mcg/mL liquid, 30 mL
Batch LLT4326 tested at 99.62% purity by HPLC. Identity was found to conform by mass spectrometry.
- Batch
- LLT4326
- Tested
- Mar 21, 2026
- Laboratory
- SR Bio Labs
Batch history
RecordEvery certificate stays on record under its batch number, even after a newer batch arrives.
| Tested | Format | Batch | Purity | Identity | Laboratory | |
|---|---|---|---|---|---|---|
| Mar 21, 2026 | 400 mcg/mL liquid, 30 mL | LLT4326 | 99.62% | Conforms | SR Bio Labs | Certificate |
How every batch is tested
MethodEvery Loti Labs batch goes to an independent, U.S.-based third-party laboratory.
- 1
Sample sent
Samples from the production batch go to the laboratory under the batch number.
- 2
Purity
HPLC separates sample components and can be used to assess chromatographic purity. Determining absolute compound content requires a validated quantitative assay.
- 3
Identity
Mass spectrometry provides evidence supporting compound identity, where reported.
- 4
Archived
The certificate is published and kept for good. Search the archive.
Questions researchers ask
ArchiveEvery certificate we have published is searchable in the COA archive.
What purity is the current T4 batch?
400 mcg/mL liquid, 30 mL: batch LLT4326 tested at 99.62% purity by HPLC on Mar 21, 2026, identity confirmed by mass spectrometry.
What is the molecular formula and weight of T4?
T4 has molecular formula C15H11I4NO4 and a molecular weight of 776.9 g/mol, CAS 51-48-9.
How do I find the certificate for my bottle?
Match the lot number printed on the bottle label to the batch column in the history table, or search it in the Loti Labs COA archive. Every certificate is kept permanently under its batch number.
What is T4 from Loti Labs intended for?
Loti Labs supplies T4 strictly for laboratory, analytical and research use. It is not for human or veterinary use, and it is not a drug, food or cosmetic.
Related compound profiles
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Research use only. This page is provided for laboratory, analytical and research reference. Products are not drugs, foods or cosmetics and are not for human or veterinary use.