Prosta Defend is a dietary supplement designed to support healthy prostate function, promote normal urinary flow, and help maintain restful sleep patterns by addressing nighttime urination frequency.According to ingredient-level research: The botanicals in Prosta Defend (saw palmetto, pygeum, stinging nettle) have been studied for their potential effects on inflammatory pathways in prostate tissue, hormonal factors involved in prostate growth, and urinary symptom severity scores in men with benign prostatic hyperplasia.