Contraceptive

Any substance or device that prevents pregnancy, either by forming a barrier that prevents the union of sperm and egg or by preventing the formation of the sperm or egg. Methods that prevent implantation of the fertillized egg are arguably abortifacients rather than contraceptives, depending on one's personal philosophy of when life begins [ORWJr].

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  Endocrine System

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  Horseradish Tree (Moringa oleifera)