T3 Cytomel is a steroid popular as both a weight loss supplement and body-building compound. Some of its androgenic properties also make it a potent anti-estrogen.
T3 Cytomel works by increasing the metabolic rate of protein, consequently having two effects on the body. First, increased protein synthesis accelerates the development of lean and tough muscles while also increasing energy production. Second, increased metabolism leads to burning of fats and calories, thus leading to weight loss. And, as mentioned, it keeps estrogen levels in check during steroid cutting cycles.