T3 (liothyronine)
T3 product Name: 3,3′,5-triiodo-L-thyronine
T3 Synonyms: L-3,3,5-Triiodothyronine, Free Acid; liothyronine; Triiodothyronine; L-triiodothyronine; 3,3′,5-triiodothyronine; 3,5,3′-triiodothyronine; 3′,5-triiodo-l-thyronin; 4-(3-iodo-4-hydroxyphenoxy)-3,5-diiodophenylalanine; 5-diiodophenyl)-3-(4-(4-hydroxy-3-iodophenoxy)-l-alanin; cytomel; l-3-(4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl)alanine; l-liothyronine; O-(4-hydroxyphenyl)-2,3,5-triiodotyrosine
T3 Molecular Formula: C15H12I3NO4
T3 Molecular Weight: 650.9735
T3 CAS: 6893-02-3
T3 EINECS: 229-999-3
T3 Purity: 98.0%
T3 Appearance: White or light yellow powder, almost tasteless.
T3 (triiodothyronine, liothyronine, Cytomel) is a thyroid hormone drug fairly commonly used for fat loss, particularly in the context of anabolic steroid cycles. T3 is naturally produced in the body as a result of T4 (thyroxine) production by the thyroid. Oral administration of T3 can yield higher levels of serum T3 than would occur naturally, allowing faster fat loss and in some cases potentially greater GH production and greater anabolism.
3,5-Diiodo-L-thyronine and 3,3′-diiodo-L-thyronine are used as ingredients in certain over-the-counter fat-loss supplements, designed for bodybuilding. Several studies have shown that these compounds increase the metabolization of fatty acids and the burning of adipose fat tissue in rats.
| Product Name | 3,3′,5-triiodo-L-thyronine |
| Synonyms | O-(4-Hydroxy-3-iodophenyl)-3,5-diiodo-L-tyrosine; L-3,3,5-Triiodothyronine, Free Acid; liothyronine; Triiodothyronine; L-triiodothyronine; 3,3′,5-triiodothyronine; 3,5,3′-triiodothyronine; 3′,5-triiodo-l-thyronin; 4-(3-iodo-4-hydroxyphenoxy)-3,5-diiodophenylalanine; 5-diiodophenyl)-3-(4-(4-hydroxy-3-iodophenoxy)-l-alanin; cytomel; l-3-(4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl)alanine; l-liothyronine; O-(4-hydroxyphenyl)-2,3,5-triiodotyrosine |
| Molecular Formula | C15H12I3NO4 |
| Molecular Weight | 650.9735 |
| CAS Registry Number | 6893-02-3 |
| EINECS | 229-999-3 |
| Molecular Structure | ![]() |
| Density | 2.387g/cm3 |
| Melting point | 234-238℃ |
| Boiling point | 602.051°C at 760 mmHg |
| Refractive index | 1.763 |
| Flash point | 317.909°C |
| Vapour Pressure | 0mmHg at 25°C |






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