T4 40 - Unique Pharma

Levothyroxine sodium, a synthetic version of the T4 thyroid hormone, has been a mainstay in hypothyroid treatment since its introduction in the 1950s. In bodybuilding, it is occasionally used to enhance fat loss by accelerating metabolism, though such use is not FDA-approved. Its slow-acting nature requires prolonged cycles to achieve visible effects, often in conjunction with anabolic steroids. Excessive dosing can induce hyperthyroidism-like effects, including rapid heartbeat, sweating, and muscle loss, underscoring the need for controlled administration .

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