What is GW50?
GW501516, a PPAR Agonist. This means it is not actually a SARM, but we all call it one anyway since you buy it from SARMs vendors. The follow was taken directly from Wikipedia:
Mode of action
GW501516 is a selective agonist (activator) of the PPAR; receptor.[29]
In rats, binding of GW501516 to PPAR recruits the coactivator PGC-1. The PPAR/coactivator complex in turn upregulates the expression of proteins involved in energy expenditure.[30] Furthermore, in rats treated with GW501516, increased fatty acid metabolism in skeletal muscle and protection against diet-induced obesity and type II diabetes was observed. In obese rhesus monkeys, GW501516 increased high-density lipoprotein (HDL) and lowered very-low-density lipoprotein (VLDL).[30]
https://en.wikipedia.org/wiki/GW501516
The Wikipedia article is sourced, so if you want the down and dirty, just follow the link then click the little numbers and get the medical journals on it. But basically, it gives you a TON of extra energy while potentially reducing your risk of one type of diabetes and potentially shifting you from bad to good cholesteral - all at the same time!