Core definitions are accurate: peptides are signaling molecules, and insulin, oxytocin, semaglutide (Ozempic), and tirzepatide (Mounjaro) are correctly identified as peptides with established human use. One closing claim — that peptides help with pain, hair growth, sexual dysfunction, brain activation, metabolism, and weight loss as a set — overreaches (human evidence varies widely by peptide and indication), but it does not overturn the accurate educational framing of the post.
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What are peptides? #peptides
Video transcriptshow
Hi, I'm Dr. Jesse Morris. You've probably been hearing a lot about peptides. So this is actually the introduction and description of how I describe them to my patients. What are they? They are small groups of amino acids, basically a small protein. They're naturally created in the body. There's about 300 to 700,000 of them. They are small groups that basically serve as signals. Go here and do this…
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. Go here and do that. Now, you've probably heard of insulin. Insulin is a peptide. Oxytocin, the hormone that increases in your body when you hug someone, is a peptide. It's a signal. It does something. It really does many things. But all of these are used to complete a task. What is a very common peptide that's prescribable? Ozempic. Ozempic was a peptide many, many years before it was ever a drug. The name is semiglutide. You've probably heard of the stronger variant now, manjaro. Well, manjaro was a peptide called terzapatide way before it was ever manjaro. There's many of these that do many different things. There's about 10 to 15 classes of them, and they all serve a different role. If you're trying to help with pain, if you're trying to help with hair growth, if you're trying to help classes of them, and they all serve a different role. If you're trying to help with pain, if you're trying to help with hair growth, if you're trying to help with sexual dysfunction, if you're trying to help brain activation, if you're trying to help reset the metabolism, if you're trying to help with weight loss, there's different ones for different things. And some of them you can mix and match, and some of them really need to be done on their own. mix and match, and some of them really need to be done on their own. This is a brief introduction video series about different peptides and how they work. But this is very important because you're going to start hearing about this. And basically think about it this way. This is a brand new class of medications, but they're natural in the body. So unlike, say, testosterone, where you inject it and your body stops making it, that does not happen with peptides. When you inject it, your body's like, oh, I got more of them, and it starts to use them. If you don't inject it, nothing happens. You just don't have more that day. Now, the caveat is a couple of them do have an impact after you stop injecting them, like growth hormone, for instance. But in general, these are very safe and very benign. Now, at appropriate doses and with appropriate measures, importantly, where you're getting them, where is the sourcing? Are they from some random website online or are they prescribed by a doctor like myself? I've been prescribing peptides since 2020, much longer than the majority of physicians. There's probably only a handful that have been prescribing longer than me and I'm comfortable with them. I have thousands of patients of the
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6 claims“Peptides serve as signals within the body, directing cellular tasks.”
Peptides are well-established signaling molecules in physiology. Biochemistry textbooks, endocrinology literature, and multiple clinical trials (e.g., NCT06474598 on MTX228, a peptide therapeutic for Type 1 Diabetes) confirm that peptides function as hormones, neurotransmitters, and cellular messengers directing metabolic, immune, and tissue-level processes. This is foundational biochemistry supported across in-vitro, animal, and human literature.
“Insulin is a peptide.”
Insulin is a canonical 51-amino acid peptide hormone produced by pancreatic β-cells—a fact established across all biochemistry and endocrinology literature. Multiple clinical trials involving semaglutide (a GLP-1 receptor agonist peptide; NCT07325435, NCT05220917) and tirzepatide (a dual GIP/GLP-1 receptor agonist peptide; NCT06657209, NCT05912621) indirectly confirm insulin's peptide nature through downstream insulin-related outcomes. This is elementary biochemistry.
“Oxytocin, the hormone that increases in your body when you hug someone, is a peptide.”
Oxytocin is a 9-amino acid neuropeptide hormone, FDA-approved as Pitocin, produced in the hypothalamus and released by the posterior pituitary. PeptIQ's internal oxytocin profile confirms this classification. Multiple human clinical trials (NCT01066299, NCT06194851, NCT02849743) investigating oxytocin's effects on startle reflex, PTSD, and weight loss validate its peptide nature and its endogenous release during social/affiliative behaviors including physical contact.
“Ozempic (semaglutide) is a prescribable peptide.”
Semaglutide (Ozempic) is a 31-amino acid GLP-1 receptor agonist peptide. It is FDA-approved for Type 2 Diabetes and weight loss. Multiple Phase 3/4 human trials confirm its efficacy and prescribability: the STEP trials (Wilding JPH et al., NEJM 2021; Lincoff AM et al., NEJM 2023) and ongoing registries (NCT07325435, NCT05220917) document significant weight loss and metabolic improvements in human subjects.
“Mounjaro (tirzepatide) is a peptide.”
Tirzepatide (Mounjaro) is a dual GIP/GLP-1 receptor agonist peptide consisting of 39 amino acids. Multiple Phase 4 human clinical trials (NCT06657209, NCT05912621) and published evidence confirm tirzepatide's peptide structure and efficacy in weight loss, lipid remodeling, and glucose control in humans, supporting its classification as a prescribable peptide therapeutic.
“There are peptides that help with pain, hair growth, sexual dysfunction, brain activation, resetting metabolism, and weight loss.”
Preclinical and early-stage animal studies support mechanistic pathways for peptides in pain management (BPC-157, TB-500 in tendon/ligament models), hair growth (some growth factor peptides in dermal models), and metabolic effects (GLP-1 analogues in rodent weight-loss models). However, no registered human clinical trials were found for a peptide addressing all six claimed outcomes simultaneously, and human evidence for hair growth, sexual dysfunction, and 'brain activation' remains extremely limited or absent. Claims conflate established preclinical directions with unproven human efficacy.
Supporting studies
This audit is for educational purposes only. Not medical advice. Science evolves — always check citation dates and consult a qualified professional.
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