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Product name:T4/L-Thyroxine
Purity : 99%min
CAS Registry Number: 51-48-9
Einecs No: 200-101-1
MF: C15H11I4NO4
MW: 776.87
Appearance :White Crystalline Solid
Standard : USP30
Grade : Pharmaceutical Grade
Storage: Shading, confined preservation

L-Thyroxine is a synthetically manufactured thyroid hormone. Its effect is similar to that of natural L-thyroxin (L-T4) in the thyroid gland. L-thyroxin is one of two hormones which is produced in the thyroid. The other one is L-triiodthyronine (L-T3, see Cytomel). L-thyroxin is clearly the weaker of the two hormones. For this rea-son it is often used for a longer time period than L-T3. Bodybuilders use L-Thyroxine to accelerate the metabolizing of carbohydrates, proteins, and fat. The body burns more calories than usual so that a lower fat content can be achieved or the athlete burns fat although he takes in more calories. In the past L-Thyroxine was often used by competing bodybuilders. Unfortunately, with increased dosages (more than 400 to 600 mcg/day) usually not only more fat but more carbohydrates and proteins are burned as well. The athlete no doubt becomes harder but he can also lose muscle mass if steroids are not administered simultaneously. L-Thyroxine is rarely used to-day since most athletes use Cytomel or Triacana. 

L-Thyroxine sodium be used to treat hypothyroidism, and is the treatment of choice for patients with hypothyroidism, who often require lifelong thyroid hormone therapy.

It may also be used to treat goitervia its ability to lower thyroid-stimulating hormone (TSH), a hormone that is considered goiter-inducing.

Levothyroxine is also used as interventional therapy in patients with nodular thyroid disease or thyroid cancer to suppress thyroid-stimulating hormone (TSH) secretion.  

1.Levothyroxine, also L-thyroxine or T4, is a synthetic form of the thyroid hormone thyroxine, which is normally secreted by the follicular cells of the thyroid gland. It is also used to treat thyroid hormone deficiency, and occasionally to prevent the recurrence of thyroid cancer. Like its naturally secreted counterpart, levothyroxine is chemically in the chiral L-form. The related drug dextrothyroxine (D-thyroxine) was used in the past as a treatment for hypercholesterolemia (elevated cholesterol levels) but was withdrawn due to cardiac side-effects.

2.T4/L-Thyroxine is pro-hormone, which your body converts into T3 at necessary rate only and thus it could be considered as much milder and safer drug than T3.

3.L-Thyroxine is an excellent fat burner since your metabolism is greatly increased while being on it. You can afford to be a little sloppier on pre-contest dieting since it will still burn fat when you are taking in a lot of calories since your metabolism is going haywire.

4.L-Thyroxine is widely used by bodybuilders and fitness addicts on pre-competition cycle in order to get relief, also used by overweighed people to reduce weight. It increases metabolism and produces general stimulating effects. However, this substance should be used wisely.