1. Vitamin D Related/Nuclear Receptor Metabolic Enzyme/Protease
  2. Thyroid Hormone Receptor Endogenous Metabolite
  3. L-Thyroxine sodium

L-Thyroxine sodium  (Synonyms: Levothyroxine sodium; T4 sodium)

Cat. No.: HY-18341B Purity: 99.50%
COA Handling Instructions

L-Thyroxine sodium (Levothyroxine sodium) is a synthetic hormone for the research of hypothyroidism. DIO enzymes convert biologically active thyroid hormone (Triiodothyronine,T3) from L-Thyroxine (T4).

For research use only. We do not sell to patients.

L-Thyroxine sodium Chemical Structure

L-Thyroxine sodium Chemical Structure

CAS No. : 55-03-8

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Solid + Solvent
10 mM * 1 mL in DMSO
ready for reconstitution
USD 66 In-stock
10 mM * 1 mL in DMSO USD 66 In-stock
500 mg USD 60 In-stock
1 g USD 78 In-stock
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Customer Review

Based on 5 publication(s) in Google Scholar

Other Forms of L-Thyroxine sodium:

Top Publications Citing Use of Products
  • Biological Activity

  • Purity & Documentation

  • References

  • Customer Review


L-Thyroxine sodium (Levothyroxine sodium) is a synthetic hormone for the research of hypothyroidism. DIO enzymes convert biologically active thyroid hormone (Triiodothyronine,T3) from L-Thyroxine (T4)[1].

IC50 & Target

Human Endogenous Metabolite


In Vivo

Deiodinases (DIOs), which catalyse the conversion of thyroxine (pro-hormone) to the active thyroid hormone, are associated with thyroid stimulating hormone (TSH) levels. DIO1 and DIO2 catalyze activation of thyroid hormone secretion in contrast to DIO3 playing role inactivation of the secretion. Activities of DIO1 and DIO2 play pivotal role in the negative feedback regulation of pituitary TSH secretion[1]. L-Thyroxine (T4) and Triiodothyronine (T3) hormones are known to modulate the expression of ionic channels, pumps and regulatory contractile proteins. Moreover, thyroid hormones have been shown to influence calcium homeostasis and flux responsible for excitation and contractility, with L-Thyroxine and Triiodothyronine modulating its pharmacological control and secretion. In rats fed 12 weeks with the iodine-free diet, a significant decrease in the levels of both Triiodothyronine and L-Thyroxine is observed when compared to the control group fed with standard diet (p<0.001). In the group treated with low doses of L-Thyroxine, an increase in L-Thyroxine levels is observed (p=0.02) while Triiodothyronine levels remain virtually similar to the control group (p=0.19). Rats treated with high doses of L-Thyroxine display a significant increase in both Triiodothyronine and L-Thyroxine circulating concentrations compared to the non-treated hypothyroid group (p<0.001 and p=0.004, respectively) and a significant increase in L-Thyroxine levels when compared to the control values (p=0.03)[2].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Clinical Trial
Molecular Weight









Room temperature in continental US; may vary elsewhere.


4°C, sealed storage, away from moisture and light

*In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light)

Solvent & Solubility
In Vitro: 

DMSO : 62.5 mg/mL (78.24 mM; Need ultrasonic)

0.5 M NaOH : 25 mg/mL (31.29 mM; ultrasonic and warming and adjust pH to 11 with NaOH and heat to 60°C)

H2O : 14 mg/mL (17.53 mM; ultrasonic and adjust pH to 12 with NaOH)

Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 1.2518 mL 6.2590 mL 12.5180 mL
5 mM 0.2504 mL 1.2518 mL 2.5036 mL
10 mM 0.1252 mL 0.6259 mL 1.2518 mL
*Please refer to the solubility information to select the appropriate solvent.
In Vivo:
  • 1.

    Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

    Solubility: ≥ 2.08 mg/mL (2.60 mM); Clear solution

  • 2.

    Add each solvent one by one:  10% DMSO    90% (20% SBE-β-CD in Saline)

    Solubility: 2.08 mg/mL (2.60 mM); Suspended solution; Need ultrasonic

*All of the co-solvents are available by MedChemExpress (MCE).
Purity & Documentation

Purity: 99.50%

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Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

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