T4 Levothyroxine 40mcg Tablets | 100-Count | Levothyroxine / T4

QSC T4 Levothyroxine (Levothyroxine / T4 (thyroid prohormone)) — ≥99% HPLC purity, MS confirmed, Janoshik COA. Research use only.

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$130

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SKU: QSC-T4-40MCG-100TAB
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QSC RESEARCH GRADE

≥99% HPLC PurityMS ConfirmedJanoshik COAIn-House SPPS5-Region Domestic Shipping

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)

For the latest Certificate of Analysis (COA), please email us with your request.
🧪 Peptide Research Tools: Use QSC’s free peptide calculators — reconstitution, BAC water, dosing, half-life, and mixing charts.
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🧬 PubMed Research — Levothyroxine
Search PubMed ↗

Source: PubMed / NCBI  ·  Last 10 years  ·  Refreshed every 24 hours  ·  For research reference only — not clinical guidance.

⚠️ RESEARCH USE ONLY — NOT FOR HUMAN CONSUMPTION

QSC products are strictly for in vitro and in vivo laboratory research. Not intended for diagnostic, therapeutic, or personal use.

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Research Use Disclaimer

All QSC products are strictly for laboratory, scientific, and research use only. They are not for human consumption, medical treatment, diagnosis, or disease prevention.

By purchasing or using QSC products, you confirm:

  • You are a qualified researcher or acting under the supervision of one.
  • Products will only be used for legitimate research purposes.
  • Products are not evaluated by the FDA or any regulatory authority for human use.
  • You assume all responsibility for legal compliance, proper handling, and storage.
  • You meet the legal age requirement in your jurisdiction.
No Warranty: Products are sold “as is,” with no express or implied warranties regarding efficacy, safety, or suitability. Results in research may vary. QSC is not responsible for outcomes, interpretations, or conclusions drawn from any studies conducted using these products.
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General Safety & Handling

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Not for Human Use

These compounds are for research only. Any off-label, personal, or clinical use is strictly outside the intended scope of supply.

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PPE Required

Always use appropriate personal protective equipment (gloves, lab coat, eye protection) when handling peptides.

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Storage Compliance

Follow product-specific storage conditions to maintain identity, purity, and biological activity.

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Proper Disposal

Dispose of all materials in accordance with institutional biosafety, chemical waste, and hazardous material protocols.

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Verify Quality

Janoshik COAs are available on every product page. Verify batch identity (MS confirmed) and purity (≥99% HPLC) before use.

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Peptide Storage Guidelines

🌑 Light-protected💧 Low moisture🌡️ Stable temperature🔬 Sterile handling

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