Tertroxin (LT-3) Tyroid Hormone

Aspen LT3

Tertroxin. Active: Liothyronine Sodium

Tertroxin LT-3 is not an anabolic/androgenic steroid but a thyroid hormone. As a substance, it contains manufactured liothyronine sodium which resembles the natural thyroid hormone Tricodide-thyronine (L-T3). The thyroid of a healthy person produces two hormones, the better known L—thyroxine (L—T4) and the aforementioned L-triiodide-thyronine (L-T3). Since Tertroxin LT-3 is the synthetic equivalent of the latter hormone, it causes the same processes in the body as if the thyroid were to produce more of the hormone. It is interesting to note that Tertroxin L-T3 is the stronger and more effective of these two hormones. This makes Tertroxin LT-3 more effective than the available L-T4 compounds such as L-thyroxine or Synthroid.

The manufacturer of the German L-T3 compound, Hoechst AG, ascribes the following characteristics to its Thybon drug, clarifying that L-T3 is superior to L-T4: “The synthetically manufactured thyroid hormone, L-triiodide-thyronine (L-T3), included in Thybon, in experimental and clinical testing has proven to be 4-5 times more active and takes effect faster than L-thyroxine (L-T4).” Tertroxin use in school medicine is to treat thyroid deficiency (hypothyroidism). Secondary symptoms are obesity, metabolic disorders, and fatigue.

Uses in Bodybuilding

Unfortunately, T3 is one of those compounds among the bodybuilding and athletic community that has gathered a large amount of mysticism, rumor, and lies that have been spread for years in regards to what it does, its use, and how it should be used.

Bodybuilders take advantage of these characteristics and stimulate their metabolism by taking Lt-3, which causes a faster conversion of carbohydrates, proteins, and fats. The lipolysis increase interests Bodybuilders. This means increased fat burning. Competing bodybuilders use Lt-3 during the weeks before a championship since it helps to maintain an extremely low-fat content, with no need for hunger diets.

Athletes who use low dosages of LT-3 report that by the simultaneous intake of steroids, the steroids become more effective, most likely as the result of the faster conversion of protein. Male and female bodybuilders use LT-3. Particularly over several months, to remain “hard” and in good shape year-round. Believe us when we tell you that to a great extent several bodybuilders pictured in muscle magazines, is taking LT-3. Their use helps to display hard and defined in photos while on a fast-food diet.

The overstimulated thyroid burns calories like a blast furnace. Nowadays, instead of LT-3, athletes use Clenbuterol which is becoming more and more popular. Those who combine these two compounds will burn an enormous amount of fat. The next time you read that a certain pro bodybuilder approaching a championship competition is still eating 4000 calories a day, you will know why.

Women and LT-3

LT-3 is also popular among female bodybuilders. Since women generally have slower metabolisms than men, it is extremely difficult for them to obtain the right form for a competition given today’s standards. By taking LT-3, you can avoid a drastic reduction of food and calories, below the 1000 calorie/day mark. Women, no doubt, are more prom to side effects than men but usually get along well with 50mcg/day. A short-term intake of LT-3 in a reasonable dosage is certainly healthier than an extreme hunger diet.


As for the dosage, one should be very careful since LT-3 is an effective thyroid hormone. It is important that one begins with a low dosage. Increasing it over several days. Most athletes begin by taking one 25 mcg tablet per day and increasing this dosage every three to four days by one additional tablet. A dosage higher than 100 mcg/day is unnecessary and not advisable. Do not take the daily dose all at once. One should break it down into three smaller individual doses. This is more effective.

It is important that you not take LT-3 over a period exceeding six weeks. At least two months of abstinence from the drug needs to follow. Those who take high doses of LT-3 over a long period are at risk of developing a chronic thyroid insufficiency. As a result, it might force the athlete to take thyroid medication for the rest of his life. It is also important to reduce the dosage by taking fewer tablets. Do not abruptly stop use. Those who plan to take LT-3 should first consult a physician to be sure that no thyroid hyper-function exists.

Side effects

Possible side effects such as medication are described in the package insert by the German pharmaceutical group Hoechst AG for their compound Thybon: ”Exceeding the individual limits of compatibility for  liothyronine or taking an overdose, especially, if the dose is increased too quickly at the beginning of the treatment, can cause the following clinical symptoms for a thyroid hyper-function): heart palpitation, trembling, irregular heartbeat, heart oppression, agitation, shortness of breath, excretion of sugar through the urine, excessive perspiration, diarrhea, weight loss, psychic disorders, etc., as well as symptoms of hypersensitivity.” Our experience is that most symptoms consist of trembling of hands, nausea, headaches, high perspiration, and increased heartbeat. Temporarily reduction of the daily dose can eliminate these negative side effects. A word of caution. Caution. When taking LT-3, especially in the beginning, effects can be quick and sometimes drastic.

Those who use LT-3for several weeks will experience a decrease in muscle mass. This can be avoided or delayed by simultaneously taking steroids. For the most part, since Tertroxin also metabolizes protein, the athlete must eat a diet rich in protein.

Tertroxin by Aspen
Tertroxin by Aspen
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