S2E15: Peptides: Evidence-Based Medicine vs. Social Media Hype
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Endocrinologist Dr. Komal Patil-Sisodia defines peptides as short amino-acid chains (with examples like insulin) and notes that any package or claim stating “contains peptides” is meaningless without knowing which peptide, how it was tested, and what it's proven to do.
She outlines the FDA approval pathway from preclinical work through Phase 1–3 trials and FDA review, then lists the FDA-approved peptides she prescribes for metabolic health (insulin analogs, GLP-1/GIP agents, glucagon, pramlintide), osteoporosis and calcium disorders (teriparatide, abaloparatide, palopegteriparatide, calcitonin), and reproductive/pituitary conditions (GnRH agonists, somatostatin analogs, vasopressin/desmopressin, cosyntropin, setmelanotide, bremelanotide).
She contrasts these with trending “gray market” peptides (e.g., BPC-157, TB-500, GHK-Cu), noting most lack published peer-reviewed randomized human trials and are often sold as “research chemicals” without purity oversight. Her key filter: ask what high-quality human evidence supports a claim — emphasizing informed choices, doctor-guided decisions, and evidence over hype.
Peptides: What I Actually Prescribe (And Why the Rest Is Hype)
By Dr. Komal Patil-Sisodia, MD | Eastside Menopause & Metabolism
Everyone is talking about peptides right now. Instagram, TikTok, wellness clinics on every corner — there's a peptide for weight loss, a peptide for sleep, a peptide for wrinkles, a peptide for muscle recovery. Honestly, at this point, a peptide for almost everything.
As a board-certified endocrinologist, I use peptides every single day in my practice. Real ones. FDA-approved ones. Peptides that were tested in thousands of patients before they ever reached my prescription pad. But here's the thing: the peptides I prescribe are probably not the ones showing up on your feed.
So What Is a Peptide, Actually?
“Peptide” has become one of those words that sounds impressive but doesn't tell you much on its own. A peptide is simply a short chain of amino acids — the building blocks of protein. String a few together and you get a peptide; string a lot together and you get a protein.
Your body makes peptides constantly. Insulin is a peptide. Many of your hormones are peptides. So when a product claims to “contain peptides,” that's about as meaningful as a product claiming to “contain molecules.” The real question isn't whether something is a peptide — it's which peptide, how it was tested, and what it's actually been proven to do.
How a Medication Actually Earns FDA Approval
This is the exact standard I hold every peptide to, including the ones flooding your feed. Research usually starts in a lab, with cells and animals — this is preclinical research, and while it's a real and necessary step, it doesn't mean a treatment works in humans yet.
From there, a promising compound can move into Phase 1 trials: a small group, usually a few dozen healthy volunteers, testing safety and tolerability rather than effectiveness. Phase 2 expands to a few hundred patients and starts asking whether the treatment actually works, while fine-tuning the dose. Phase 3 is the big one — hundreds to thousands of patients, often across multiple centers, compared against a placebo or the current standard of care. This is where we learn whether a treatment truly outperforms what we already have, and where rarer side effects tend to surface.
If Phase 3 succeeds, the company submits everything to the FDA — safety data, effectiveness data, manufacturing data — for review. The whole process usually takes years, sometimes over a decade, and most compounds never make it all the way through. That's not a broken system. That's a system built to catch problems before they reach you.
So when I say there's no published human data for a lot of trending wellness peptides, this is specifically what I mean: most are still sitting at the preclinical stage, or maybe just entering Phase 1, if they've entered human testing at all. They haven't been shown to work in people. They haven't been shown to be safe at scale.
What I Actually Prescribe
Grouped by what they treat, because that's how I think about them in clinic:
Diabetes and metabolic health: insulin analogs (lispro, aspart, glargine, detemir, degludec, glulisine), GLP-1 receptor agonists (exenatide, liraglutide, lixisenatide, dulaglutide, semaglutide), the dual GIP/GLP-1 agonist tirzepatide, glucagon, and pramlintide
Osteoporosis and calcium disorders: teriparatide, abaloparatide, palopegteriparatide, and calcitonin
Reproductive and pituitary conditions: GnRH agonists (leuprolide, goserelin, triptorelin, histrelin, nafarelin), somatostatin analogs (octreotide, lanreotide, pasireotide), vasopressin and desmopressin, cosyntropin, setmelanotide, and bremelanotide
Every one of these went through clinical trials. Every one has a specific, defined use. For every one, I can tell you exactly what evidence supports it, at what dose, and for whom.
What's Flooding Your Feed
The peptides you're actually hearing about on social media are a different list — names like BPC-157, TB-500, and GHK-Cu, tied to claims about faster injury healing, anti-aging, better sleep, and fat loss.
Some of these compounds have real, interesting data — in mice, in rats, in petri dishes. That's genuinely how a lot of good drugs start out. But there's a long road between “this helped a rat's tendon heal” and “this is safe and effective for you,” and that road runs through human clinical trials with control groups, safety monitoring, and FDA review. Most trending wellness peptides haven't made that trip.
Many are also marketed as “research chemicals” — a legal way of saying they aren't approved for use in people at all. That label means no guarantee of purity, no standard for what's actually in the vial, and no oversight of manufacturing. None of this means every unapproved peptide is dangerous, or that the scientists studying them are wasting their time. Early-stage science is how we get tomorrow's real medications. But early-stage is exactly what it is. Promising is not the same as proven.
A Personal Note
Last week I posted about an FDA advisory committee vote on whether certain peptides should be allowed through compounding pharmacies — a quick comment noting that most of the data on these compounds comes from mice. The response was, to put it mildly, polarizing.
Several comments told me I was spreading misinformation and that human studies already exist for most gray-market peptides. One woman said she'd personally seen human data; when I asked her to send the citations, she told me to do my own research because Google is free.
I did do the research. That's my job. As of today, there are no published, peer-reviewed randomized controlled trials in humans for most peptides in the gray-market category. Not hard to find. Not buried on page three. Not published. If that changes, I want to see it — send it to me directly, and I'll update my position, because that's how good medicine is supposed to work.
Some comments went further than disagreement into being outright hateful, and that stung. But a lot of you showed up too, agreeing that we need real, published human data before calling something safe or effective — and that response is a big part of why this episode exists. Disagreement is fine. “Cite your source” is not an unreasonable ask from a doctor. “Go Google it yourself” is not a source.
The One Question
How do you tell the difference between real evidence and a good marketing story? Ask: “What high-quality human evidence supports this?” Not animal data. Not testimonials. Real clinical trials, in real people, published somewhere other than a company's own website.
If the answer is “there isn't any yet,” that doesn't necessarily mean the product is a scam — it means you're being asked to be an early, unpaid experiment. That might be a risk you're willing to take. But it should be an informed choice, not an accidental one. And if a peptide does have that evidence, the conversation belongs with your doctor, not a sponsored post.
The Bottom Line
Peptides aren't inherently good or bad. The word just describes a type of molecule. What matters is the evidence behind the specific one you're considering — the dose, the source, and whether it treats the condition you actually have. Before you spend your money or put something in your body, ask what human evidence supports it. Evidence over hype, every time.
Follow Dr. Komal Patil-Sisodia:@drpatilsisodia on Instagram and TikTok
This content is for educational purposes only and does not constitute personalized medical advice. Please discuss your specific health concerns with your own healthcare provider.