What is T4 (Thyroxine / Levothyroxine)?
T4 (Thyroxine/Levothyroxine) is the primary secretory product of the thyroid gland — a prohormone converted to active T3 (triiodothyronine) by deiodinase enzymes. Acts on thyroid receptors (TRα/TRβ) to regulate metabolism, thermogenesis, cardiac function, and gene expression. Research tool for thyroid hormone pharmacology, metabolic rate, and HPT axis studies. Research use only.
Research Applications
T4-to-T3 Conversion
Deiodinase enzyme activity, tissue-specific T3 production, substrate kinetics
Thyroid Receptor Pharmacology
TRα vs TRβ selectivity, nuclear receptor binding, TRE-mediated transcription
Metabolic Rate Research
Basal metabolic rate upregulation, thermogenesis, mitochondrial uncoupling interaction
HPT Axis Research
Hypothalamic-pituitary-thyroid feedback — TSH suppression, TRH regulation
Cardiac Thyroid Research
TRα-mediated cardiac chronotropy, myosin heavy chain isoform switching
Quick Specs
| Form |
C₁₅H₁₁I₄NO₄, MW 776.9 |
| Purity |
≥99% by HPLC — every batch |
| CAS Number |
51-48-9 |
| Molecular Weight |
MS molecular weight confirmed — every batch |
| Specification |
≥99% by HPLC — every batch |
| Shelf Life |
24 months (unopened) |
| Storage |
Room temperature sealed | cool, dry storage |
| Manufacture |
In-house synthesis — Qingdao, China |
| Brand |
China |
Frequently Asked Questions
How do I reconstitute this peptide?
QSC raw powder compounds are supplied as bulk crystalline or amorphous powder in a sealed, labelled container at the stated quantity. No reconstitution is required — the powder is ready for weighing and use in research applications.
How should this peptide be stored?
Store at room temperature (15–25°C) in a cool, dry place away from moisture, heat, and direct light. Keep in the original sealed container. Properly stored raw powder remains stable for 2–3 years.
What purity is this QSC compound and how is it verified?
All QSC raw powder compounds are tested to ≥99% purity by HPLC on every production batch, with MS-confirmed identity. 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 5–7 days
🌏 International shipping: 7–14 days
⚠️ RESEARCH USE ONLY — NOT FOR HUMAN CONSUMPTION
QSC products are strictly for in vitro and in vivo laboratory research.
Safety & Handling
🚫
Not for Human Use
These compounds are for research only.
🥽
PPE Required
Always use appropriate protective equipment.
❄️
Storage Compliance
Follow product-specific storage conditions.
Product-Specific Storage
Room temperature sealed | cool, dry storage
