When should I use triiodothyronine (T3)?

Triiodothyronine (T3) is a thyroid hormone that is primarily use for treatment of hypothyroidism (underfunction of the thyroid) and in some cases for weight loss. However, we need to use T3 with great caution, especially in healthy people, as improper use can cause serious side effects such as heart problems, osteoporosis, and metabolic disorders. Here are some common uses and dosage ranges.

Treatment of hypothyroidism

Indications: Hypothyroidism (when the thyroid gland is unable to produce enough thyroid hormone).

Dose: Triiodothyronine T3 Usually starting use from 5-25 MCG/day, we have to adjust the dose according to the patient's thyroid function tests and symptoms. The maximum dose is generally not more than 75-100 MCG/day.

Triiodothyronine Promote weight loss

Indications: Bodybuilders will try T3 to speed up metabolism and reduce body fat.

Dosage: The dose for over-the-counter and non-medical use is usually 25-50 MCG/day, but some people will gradually increase to 75-100 MCG/day. The risk of side effects increases significantly with increasing doses, and avoid prolonged and high doses.

For bodybuilding or competition preparation (cutting)

Indications: Some bodybuilders use T3 in preparation for competitions to accelerate fat consumption for leaner muscle mass and a more tailored overall physique.

Dose: The dose is usually 12.5-50 MCG/day, with some people increasing to 75-100 MCG/day in the short term, but long-term or high dose use may bring more side effects.

Precautions when using:

Monitoring: When using T3, thyroid hormone levels in the blood need to be tested regularly to ensure that the dose is appropriate and does not cause hyperthyroidism.

Gradual adjustment: It is usually recommended to start with a low dose and gradually increase it to avoid sudden metabolic overspeed.

Side effects: Common side effects include palpitations, anxiety, insomnia, and loss of bone mineral density, especially at higher doses.

Medical advice

If you are considering T3, you'd better consult an endocrinologist first. They can assess your thyroid function and decide if you need T3, as well as the appropriate dose.