Uncontrolled Substance is the debut studio album by American rapper and Wu-Tang Clan member Inspectah Deck. The album was released on October 5, 1999, under Loud Records. Originally slated for release in 1995, the record was indefinitely postponed after a flood destroyed over 100 beats in RZA's basement, including his original productions for the album. Eventually released four years later, Uncontrolled Substance received mostly positive reviews, and is Inspectah Deck's most critically acclaimed and most commercially successful album to date. The album features Wu-Tang Clan members U-God and Masta Killa, and appearances from lesser-known affiliates Street Life, Killa Sin, and LA the Darkman. A music video was made for the songs "Word on the Street" directed by Gregory Dark & "Show 'N' Prove" directed by Joseph Kahn. The album's liner notes state that it is dedicated to Inspectah Deck's late father, Frank Hunter.

Wu-Tang Clan is an American hip hop collective formed in Staten Island, New York City, in 1992. Its members include RZA, GZA, Method Man, Raekwon, Ghostface Killah, Inspectah Deck, U-God, Masta Killa, and, until his death in 2004, Ol' Dirty Bastard. Close affiliate Cappadonna later became an official member. They are credited for revitalizing East Coast hip hop and are considered one of the greatest hip hop groups of all time.