T4 Levothyroxine 40mcg Tablets | 100-Count | Levothyroxine / T4
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T4 Levothyroxine 40mcg Tablets | 100-Count — Thyroid prohormone (levothyroxine) — converted to active T3 by peripheral deiodinases; studied for thyroid replacement pharmacokinetics, deiodination pathway research, and comparative T3/T4 dynamics. ≥99% HPLC purity, MS confirmed, Janoshik COA. Research use only.
* The information on this page is a summary and is not intended to cover all available information about this medication. It does not cover all possible uses, directions, precautions, drug interactions or adverse effects and is not a substitute for the expertise and judgement of your healthcare professional.
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What is T4 Levothyroxine?
Levothyroxine (T4) is the primary secretory product of the thyroid gland — a prohormone requiring peripheral conversion to T3 (by deiodinase DIO1/DIO2) for full activity. Research: prohormone conversion biology, DIO1/DIO2 enzyme research, hypothyroid replacement models, T4/T3 axis feedback. CAS 51-48-9.
Research Applications
Prohormone Conversion
T4→T3 via DIO1/DIO2 deiodinase — peripheral thyroid activation
Deiodinase Biology
DIO1/DIO2/DIO3 substrate and enzyme research
Hypothyroid Replacement
Standard replacement model — T4 vs T4+T3 combination
Thyroid Axis Feedback
TRH/TSH/T4/T3 feedback loop regulation
T4 vs T3 Comparison
Prohormone vs active hormone — direct pharmacological comparison
Quick Specs
| Form | Tablet — 40mcg per tablet, 100-tablet bottle |
| CAS Number | 51-48-9 |
| Molecular Formula | C₁₅H₁₁I₄NO₄ |
| Molecular Weight | 776.87 g/mol |
| Compound Type | Thyroid Hormone |
| Purity | ≥99% by HPLC — every batch |
| Identity | MS molecular weight confirmed — every batch |
| COA | Janoshik-independent, publicly verifiable |
| Manufacture | In-house synthesis — Qingdao, China |
| Storage | Room temperature sealed | cool, dry storage |
| Shelf Life | 24 months unopened |
Certificate of Analysis (COA)
Frequently Asked Questions
Frequently asked questions
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