Restricted products are controlled substances that require special processing and license verification before shipping. Domestic sales require the buyer to have either a current U.S. DEA Analytical or Researcher Controlled Substance Registration. International sales require the buyer to obtain either an import license or a Letter of No Objection from their government. For more information on this process, please read Why can it take so long to have my reference standard delivered overseas? WARNING: These products are for research only—not for human or veterinary or therapeutic use.