The National Toxicology Program (NTP) has issued a request for information "to facilitate the design of toxicological studies for vinpocetine," a semi-synthetic derivative of the dietary supplement vincamine. The agency specifically seeks information regarding (i) exposure, pharmacokinetics, toxicity, safety, or efficacy in humans; (ii) production, use and consumption patterns in the United States; (iii) genotoxicity, repeated dose toxicity, prenatal developmental toxicity, reproductive toxicity, chronic toxicity, and carcinogenicity studies in experimental animals; and (iv) any other information relative to the safety or toxicity of vinpocetine. Comments will be accepted until November 4, 2013. See Federal Register, September 24, 2013.