T3 25 mcg

T3 25 mcg contains liothyronine sodium, a synthetic thyroid hormone. In medical practice, it is approved for hypothyroidism and as a diagnostic agent in thyroid suppression tests. In non-medical bodybuilding contexts, it is commonly referenced during cutting phases for metabolic rate enhancement, though such use falls outside approved indications.

In FDA-approved labeling, liothyronine sodium is administered orally once daily for hypothyroidism. In non-medical bodybuilding contexts, it is commonly referenced as being taken once daily or split into smaller doses throughout the day. The biological half-life of approximately 2.5 days supports once-daily dosing for most purposes.

No. T3 does not suppress the hypothalamic-pituitary-gonadal axis and does not require post-cycle therapy for testosterone recovery. However, the thyroid axis is suppressed during T3 use, and a gradual taper over 1–2 weeks is commonly recommended to allow endogenous thyroid hormone production to resume.

Liothyronine is the synthetic form of T3, the biologically active thyroid hormone. It diffuses into cell nuclei and binds to thyroid receptor proteins, activating gene transcription and increasing metabolic rate. T3 affects carbohydrate, fat, and protein metabolism, as well as heart rate, body temperature, and growth.

Liothyronine has a rapid onset of action, with a detectable metabolic response within hours of administration and maximum effect within 2 days. In bodybuilding discussions, users sometimes report subjective effects on body temperature and energy within the first week of use. Individual response varies.

FDA labeling explicitly states that thyroid hormones should not be used for weight loss, as larger doses may produce serious or life-threatening toxicity. While T3 increases metabolic rate and can promote weight loss, clinical research shows that a significant portion of this weight loss comes from lean body mass rather than fat. No thyroid hormone is approved for weight loss.

T3 (liothyronine) is the active form of thyroid hormone, while T4 (levothyroxine) is a prohormone that is converted to T3 in peripheral tissues. Approximately 80% of circulating T3 is derived from T4 conversion. T3 has a more rapid onset and shorter half-life than T4, making it useful when rapid dose adjustment is needed.

T3 and Clenbuterol work through entirely different mechanisms. T3 is a thyroid hormone that increases metabolic rate through nuclear receptor activation, while Clenbuterol is a beta-2 agonist that stimulates the sympathetic nervous system. In non-medical bodybuilding contexts, they are sometimes referenced together, but this combination carries significant cardiovascular risks. Axiolabs offers Clenbutaplex as its Clenbuterol product.

Yes. In medical practice, the usual maintenance dose for hypothyroidism is 25–75 mcg daily. Doses above 75 mcg are associated with increased risk of cardiac arrhythmias and other serious adverse effects. T3 25 mcg contains 25 mcg per tablet, so 100 mcg would equal four tablets daily, which represents a supraphysiologic dose.

T3 25 mcg is supplied as 25 mcg liothyronine sodium tablets in 50-tablet or 100-tablet packages, giving 1,250 mcg or 2,500 mcg of total labeled liothyronine sodium content.

Yes. Clinical research has demonstrated that T3 increases protein catabolism, and that weight loss from T3 can come at the expense of lean body mass rather than fat alone. In non-medical bodybuilding contexts, this is a primary concern, and T3 is often referenced alongside anabolic steroids to help preserve muscle mass.

Yes. T3 increases heart rate and myocardial oxygen demand, and at higher doses can trigger atrial fibrillation and other arrhythmias. Any history of cardiac disease, hypertension, or arrhythmia is a contraindication to non-medical T3 use. Medical supervision is essential when liothyronine is used therapeutically.