Keep in mind, the above combination will rejuvenate libido and increase sex drive -but they not only help male sexual health, they help overall health and wellbeing to. In 1988 researchers found that L-arginine's vast-ranging health and fitness advantages had been due principally to its position as a precursor to nitric oxide. A progesterone blood test is conducted to ascertain how much of the progesterone hormone is within a sample of blood. This female hormone is produced whenever a mature egg is released from an ovary within a process generally known as ovulation. This hormone helps to prepare the endometrium (uterine lining) to just accept the egg if sperm fertilizes it. If the egg goes without getting fertilized, menstrual bleeding occurs and progesterone levels drop.