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Contact Newsweek editors on this story: Sam Stevenson and Shakeema Edwards.

These melanocortin receptors help regulate sexual function, among other things

Third, the emergence of research peptides in areas like tissue repair and regenerative medicine shows promise, but proper clinical development is essential to establish their safety and efficacy in humans

AOD-9604, a fragment of human growth hormone, is designed specifically for fat breakdown and is positioned to reduce fat stores without affecting blood sugar or lean muscle, while Tesamorelin works through a similar fat-targeting approach though it carries FDA approval only for HIV-related lipodystrophy rather than general weight loss