Other: Compound Reference

Dopamine agonist. Used to control prolactin on 19-nor cycles.

Effects: Lowers prolactin, powerful dopamine agonist. Used alongside Nandrolone/Trenbolone to prevent prolactin-related sides.

Synthetic thyroid hormone T3. Used in contest prep for metabolic boost.

Effects: Suppresses TSH, reduces T4 production, increases metabolic rate, can be catabolic without AAS, takes weeks for thyroid function to recover after cessation

Synthetic thyroxine, identical to the T4 the thyroid produces. First-line replacement for hypothyroidism. A prohormone: it must be deiodinated to T3 in peripheral tissue before it does anything, which makes it slower and more forgiving than T3.

Effects: Suppresses TSH dose-dependently. Raises Free T4 and, via peripheral conversion, Free T3. Increases reverse T3 when supplied in excess or during low energy availability. Over-replacement raises resting heart rate, accelerates bone loss, and increases atrial fibrillation risk. No direct effect on testosterone, oestradiol, liver enzymes, or haematocrit; lipids improve when genuine hypothyroidism is corrected.

Selective β3-adrenergic receptor agonist. Originally approved for overactive bladder (Astellas, brand name Myrbetriq). Increasingly used in fat-loss protocols for its ability to activate brown adipose tissue (BAT) thermogenesis without the β2-driven cardiac and tremor side effects of [Clenbuterol](/compounds/other-compounds/clenbuterol).

Effects: Activates brown adipose tissue thermogenesis, increases resting energy expenditure (~200 kcal/day at clinical doses), promotes browning of white adipose tissue, improves insulin sensitivity (BAT glucose uptake), may modestly improve HDL cholesterol. Mild blood pressure elevation, mild heart rate increase, urinary retention risk, dry mouth. No suppression of HPTA. No direct impact on liver enzymes at standard doses.

Beta-2 adrenergic agonist used as a bronchodilator and thermogenic fat-loss agent. Not an anabolic steroid. Widely used in contest prep and cutting phases for its metabolic and anti-catabolic effects.

Effects: Increases metabolic rate and core temperature, stimulates lipolysis, mild anti-catabolic effect, elevates heart rate and blood pressure, can cause electrolyte imbalances (taurine/potassium depletion), may worsen cardiac hypertrophy with chronic use