What role does Progesteron play in Fruchtbarkeit?

Progesterone plays a critical role in fertility. After ovulation, the corpus luteum produces progesterone to transform the endometrium into a receptive lining for embryo implantation. Adequate progesterone levels during the luteal phase are essential for maintaining early pregnancy. Deficiency can lead to implantation failure or recurrent miscarriage. The evidence for this is human-strong, supported by decades of clinical reproductive medicine. Progesterone supplementation is standard in assisted reproduction and luteal phase support. However, individual responses vary; genetic variants in the progesterone receptor (e.g., rs1042838) may modulate sensitivity, but such testing is not routine. MyBody-X does not directly measure progesterone; hormone testing should be done under medical supervision. Caution: unguided progesterone use can cause side effects. This answer is based on established medical knowledge, not on the provided context.