Winstrol is generally not preferred for building mass as it is highly anabolic and very slightly androgenic, an oral Steroid such as Dianabol is usually a better choice for people wanting to bulk up. Due to its ability to dramatically lower SHBG it can be used in a bulking cycle as a means to make other hormones more efficient, increase free testosterone and even solidify gains to a stronger degree but most of the people will find other steroids to be far more beneficial than winstrol in the long run. However some people are very sensitive to side effects of certain Steroids such as Dianabol, and would rather use Winstrol in a bulking cycle, while the weight gain wont be as dramatic as with Dianabol, with a proper high calorie diet, you can still see good results.
Before you can understand why Trenbolone works the way it does, you first need to understand that you have two types of fat, or adipose tissue, in your body. First, you have visceral adipose tissue, which surrounds your organs and has very little effect on your overall appearance. Second, you have subcutaneous adipose tissue, which rests just below the skin and has a tremendous impact on your appearance. As Trenbolone binds to androgen receptors (which it does very well), it inhibits lipid uptake. This means that your body cannot continue to add to its subcutaneous fat stores. As such, when you work out, you burn away the subcutaneous adipose tissue and obtain the “cut” appearance. This is why Tren is widely regarded as the best steroid to lose weight.
Of concern to any user of Winstrol during a cycle should be its intoxicating effect on the liver . The drug is a 17aa structured steroid , meaning it has been structured in a way which allows it to be orally bio-available, yet this has the negative effect of making Winstrol potentially harmful to the liver. It is therefore paramount the duration of a Winstrol cycle is limited, the dose of the drug is not excessive, the user does not stack it with other hepatotoxic compounds, does not drink alcohol whilst on cycle, and does not use Winstrol if they have an underlying medical condition which effects the livers health. There are supplements available which also help protect the liver (Milk Thistle, Liv-52 etc), and these would be advisable during any Winstrol cycle .