Ships from our International Warehouse — 6–8 business days. Standard international customs may apply.
≥99%
Verified Purity
6
Days to Spain
COA
On Every Order
Why Researchers in Spain Order T4 (Levothyroxine) from QSC
QSC maintains a dedicated International Warehouse — your order ships with full tracking, no import delays. Every unit of T4 (Levothyroxine) (Thyroid Prohormone) is verified at ≥99% purity by HPLC and mass spectrometry, and ships with a Certificate of Analysis independently verifiable via the Janoshik portal. Typical delivery to Spain: 6–8 business days.
Shipping Details for Spain
Warehouse
International Warehouse
Delivery Time
6–8 business days
Customs
Standard international customs may apply.
Tracking
Full tracking provided via email after dispatch
Payment
Bitcoin (BTC) or USDT ERC-20
T4 (Levothyroxine): Research Background
Class: Thyroid Prohormone
Mechanism: Levothyroxine is the prohormone form of thyroid hormone, converted to active T3 by deiodinase enzymes in peripheral tissues. Provides sustained thyroid hormone activity via peripheral conversion — half-life ~7 days vs T3’s ~1 day.
Researchers studying T4 (Levothyroxine) frequently also investigate: T3 (Liothyronine), Sermorelin, CJC-1295. View the full QSC catalog →
Frequently Asked Questions
Is T4 (Levothyroxine) legal to buy in Spain?
T4 (Levothyroxine) is sold strictly for laboratory research purposes only. Researchers in Spain are responsible for understanding applicable local regulations.
How long does shipping to Spain take?
Orders ship from the International Warehouse. Typical delivery to Spain: 6–8 business days. Standard international customs may apply.
How is T4 (Levothyroxine) purity verified?
HPLC purity analysis, mass spectrometry molecular verification, and impurity profiling on every batch. COA published on product page, verifiable via Janoshik portal.
What formats of T4 (Levothyroxine) are available?
QSC stocks T4 (Levothyroxine) in Tablets format. View current options and pricing via the button below.
