GHRP-2 is a synthetic chemical of ghrelin, a hormone that is produced and released mainly by the stomach. Ghrelin has been shown to have two major effects, stimulating both growth hormone secretion and appetite/meal initiation. It has been called the 'hunger hormone' because it stimulates appetite, increases food intake and promotes fat storage.
Collins will forfeit about $610,000 for the 25-game suspension.
The 22-year-old Collins is entering his third season after the Hawks took him with the No. 19 overall pick in 2017 out of Wake Forest. In five games this season, Collins is averaging 17.0 points and 8.8 rebounds.
Collins is the third NBA player to be suspending for violating the league's drug policy since the summer, joining the Nets' Wilson Chandler and the Suns' Deandre Ayton.
In his absence, the Hawks will likely look to Jabari Parker to take on expanded role. Parker is averaging 13.8 points and 3.8 rebounds in 22.1 minutes per game.