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Mesterolone (CIII), an androgen and dihydrotestosterone derivative, has been used for replacement therapies and in bodybuilding mainly for anti-estrogenic activity in anabolic steroid stacks. It is a DEA CONTROLLED SUBSTANCE - SCHEDULE I drug and does require DEA registration by the customer and completion of DEA purchase notification forms. It is not produced under current Good Manufacturing Practices (cGMP) and is considered Not Suitable For Food or Drug Use. Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use.