bpc-157 derived from gastric pentadecapeptide Stable BPC 157 can improve the healing course of spinal cord injury and lead to functional recovery in rats | Journal of Orthopaedic Surgery and Research The Stable Gastric Pentadecapeptide BPC
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There are over 7000 know to science naturally occurring in nature and research is ongoing in mastering their use in the quest for optimal human performance

And which are considered the best peptides for muscle growth

PMID: 42231627 Int J Gen Med Evaluating Semaglutide's Protection in H/R - Injured AC16 Cardiomyocytes: Oxidative Stress, Inflammation, Apoptosis, and Autophagy Insights

Mother Nature put it there for a reason

Progesterone is the major female reproductive hormone, especially during the latter 2 weeks of the monthly menstrual cycle, where it is made by a part of the ovary called the corpus luteum