T4- Liothyronine sodium is a synthetic thyroid hormone commonly known under the levothyroxine name. Usually used for hypothyroidism treatment and is a synthetic version of T4 hormones produced by the thyroid gland. T4 has a positive effect on the central nervous system, fat burn, cellular functions and overall body wellbeing. Effects: Using T4, athletes can improve physical body performance and effectively lose weight without feeling hungry. Side-Effects: The most common adverse reactions attributed to the T4 are insomnia, trembling, worriedness, irregular heartbeat, and natural Thyroid hormone reproduction suppression. Protection: To reduce side effects, include Beta-adrenoblockers and ketotifen in your cycle. Use T4 in the first half of the day to avoid insomnia. Stacking: Additional care should be taken when stacking T4 with other medication affecting blood pressure and heart rate.