North Carolina Administrative Code Title 17 — Revenue 17 NCAC 04D .0508 — Natural Products Exemption Determined Last amended: Authority G.S. 105-113.46; 105-113.47; 105-262; Eff. October 1, 1991; Amended Eff. August 1, 1998; March 1, 1995; January 1, 1994; Repealed Eff. July 1, 1999. Source: official text