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BPC-157 is used for tendon and ligament healing by stimulating fibroblast proliferation, upregulating collagen synthesis, and activating the FAK-paxillin pathway, which drives cell migration toward injury sites

Although one thought may be through the upregulation of neurotransmitters in which are directly correlated with Testosterone, specifically dopamine

Kisspeptin: controls GnRH neurons and puberty onset

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Speichinger notes that sometimes there is a second step to the progesterone challenge, where estrogen is given first and followed by progesterone, to cause the withdrawal period