What Is a Peptide, and How Does It Work?
A peptide is a chain of amino acids, specifically a chain of between two and roughly 50 amino acids bonded together. Longer chains become proteins. Shorter ones, at two amino acids or more, are peptides.
Peptides function primarily as signaling molecules. They carry messages between cells, influencing downstream processes in ways that are both targeted and far-reaching.Ā
For example, GLP-1 peptides act as hormone signals that tell the body to shift several systems at once. The āmessageā is essentially:Ā regulate appetite, improve blood sugar control, and slow nutrient intake, with downstream effects that can indirectly help with menopausal symptoms.
A 2024 study published inĀ MenopauseĀ found that postmenopausal women on both semaglutide and hormone therapy lost significantly more weight than those on semaglutide alone.
Ā A 2025 analysis found that perimenopausal women in their 40s and early 50s lost similar amounts of weight on these medications as women in other reproductive stages, confirming that hormonal changes do not prevent them from working.Ā
Peptides are distinct from hormones, though the two categories overlap.Ā Some peptides are hormones, and some hormones are peptides (insulin begin a good example), which is part of what makes the category feel confusing from the outside. The important thing to understand is that peptides are cellular messengers, and that they operate at the mitochondrial level in ways that make them pharmacologically meaningful.
Peptide therapy can be a wonderful adjunct to integrative midlife health optimization. While I don't directly prescribe them, I can provide guidance on how to createĀ well-managedĀ peptideĀ protocol that doesn't just provide a prescription but provides guidance on protein intake and resistance training as non-negotiable components along with recommendations for assessingĀ lean body mass, not only the number on a scale. Research consistently supports targeting protein at the upper end of clinical recommendations and incorporating at least two to three resistance training sessions per week for women using these medications in midlife.