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Unlike medications that compete for absorption or liver metabolism, collagen is broken down into amino acids (primarily glycine, proline, and hydroxyproline) during digestion and used for connective tissue repair

Some of the neurosteroids catalyzed by 5 reductase-1, including allopregnanolone, have been reported to augment GnRH release at puberty through activating the stimulatory GABA A receptor [53, 54, 61]

American journal of critical care: an official publication, American Association of Critical-Care Nurses

Combining peptides with complementary dark circle treatments Vitamin C serums provide synergistic brightening through tyrosinase inhibition reducing melanin synthesis, antioxidant protection preventing ongoing pigmentation from UV and oxidative stress, and collagen synthesis support enhancing peptide-induced improvements through complementary pathway

Acknowledgements This research was funded by the National Key Research and Development Program of China (2021YFC2301500