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Progesterone is a steroid hormone that regulates the menstrual cycle and is essential for pregnancy. It is also commonly used to induce melasma models.

Progesterone (Standard) is the analytical reference standard of Progesterone used for quantitative determination, quality assurance, and biochemical experimentation, and this steroid hormone plays a critical role in regulating the menstrual cycle, maintaining pregnancy, and is frequently employed in experimental models for inducing melasma and studying endocrine regulation.