Mast-ext 200 is an injectable steroid. The properties of this product are that the release of the steroid is considered to be slow and the treatment for let’s said breast cancer can last very long. Your physique will greatly benefit from the aesthetic effects that Mast-ext can bring. Results are even possible with small doses that are around 200 mg per week. Side effects of this steroid can be cardiovascular, hepatotoxic, androgenic, and estrogenic. It is advised to utilize this product with other steroids for the greatest results and minimal problems.