T4 Levothyroxine 40mcg | 100-Count | Thyroid Research

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

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.

✓ 99%+ Purity	✓ COA Available
✓ Free Shipping on All Orders	✓ Ships from Domestic Warehouses (🇺🇸) + China (🇨🇳)

$130

QSC RESEARCH GRADE

≥99% HPLC PurityMS ConfirmedJanoshik COAIn-House SPPS1-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.

Frequently Asked Questions

How are QSC research tablets supplied?

QSC research tablets are supplied as pre-dosed oral tablets at the stated concentration. No reconstitution is required. Each tablet is compressed at uniform dose for consistent dosing in research applications.

How should research tablets be stored?

Store at room temperature (15–25°C) in a cool, dry place away from moisture, heat, and direct sunlight. Keep in the original container. Properly stored tablets remain stable for 2–3 years.

What purity are QSC research tablets and how is it verified?

QSC research tablets contain active ingredient at ≥99% HPLC purity before tableting, with MS-confirmed identity on every batch. COA is published on the product page and independently verifiable at verify.janoshik.com.

🧪 Peptide Research Tools: Use QSC’s free peptide calculators — reconstitution, BAC water, dosing, half-life, and mixing charts.

🌍 Domestic shipping: 🇺🇸 USA · 🌏 International: China warehouse — 7–14 day global delivery