Slang for insulin and typically used by bodybuilders.
Insulin is a highly anabolic hormone; however, it is not a steroid. A steroid is a
type of hormone, but not all hormones are a steroid. Insulin is not a steroid because it not a derivative of a lipid; however, other than that, it is very similar to a steroid. For this reason testing for insulin is non existent.
Insulin by itself will not give you
big muscles, it is best used with anabolic steroids that increase muscle tissue, such as Testosterone, Deca, and Dianabol. This is known as "stacking hormones".
The reason insulin is a
great muscle builder is because of
one simple fact: Every cell stores glycogen. Excess calories you eat will be converted into glycogen. Insulin tells every
single cell in your body (muscle,
fat, connective, even nervous tissue cells) to
store glycogen. When you inject insulin you're essentially forcing your cells to take in more glycogen.
This is where the stacking comes in. Using insulin without steroid hormones your body will give all the glycogen to your fact cells, making you fatter. This is why insulin has a
bad rep for weight gain. Steroid hormones (especially the 3 I listed) make your muscles bigger, allowing a higher quantity of glycogen to be stored in your muscles. Steroids also
block fat production, meaning glycogen won't go to the
fat cells. The combination of all this causes insulin to be very powerful in terms of building muscle size.
