If you’ve been hearing about “peptides,” you’re not imagining it—they’ve become a hot topic in medicine, fitness, and even skincare. But what matters when you live with Type 1 diabetes (T1D)?
I want to share some clarity, not just as a functional dietitian but as someone who’s lived with T1D for over 30 years—and who has personally been on Ozempic (a GLP-1 peptide) since 2018.
Peptide 101: What They Are and Why They Matter
Peptides are short chains of amino acids—the building blocks of proteins. If proteins are like full-length novels, peptides are the short stories. They act as messengers in the body, carrying out targeted tasks like:
- Stimulating hormone release (like insulin)
- Repairing tissues and reducing inflammation
- Signaling satiety and regulating appetite
- Supporting gut health and nutrient absorption
Fun fact: Insulin itself is a peptide hormone. That means anyone with T1D is already using peptide therapy every single day.
Where Peptides Show Up in Health & Wellness
- Medical (Prescription-based)
- GLP-1 receptor agonists: Ozempic, Trulicity, Mounjaro, Victoza
- GLP-2 analog: Gattex for short bowel syndrome
- Growth hormone secretagogues (like sermorelin)
- Functional & Experimental
- BPC-157 (gut healing and tissue repair—still unapproved) – options exist to source this on Fullscript/Quicksilver is one brand, for example.
- Thymosin-beta-4 (immune modulation research)
- Cosmetic & OTC
- Skincare peptides for collagen and anti-aging – although I wonder how larger forms of amino acids, aka peptides, can be absorbed in the skin.
GLP Peptides: Why They’re Getting Attention
The GLP family of peptides (glucagon-like peptides) is secreted in the gut. Each member has different effects:
GLP-1: The Blood Sugar Helper
- What it does: Stimulates insulin release when glucose is high, suppresses glucagon, slows digestion, and reduces appetite.
- Medications: Ozempic, Wegovy, Rybelsus, Trulicity, Victoza, Mounjaro (dual action—see below).
- Dosing:
- Type 2 diabetes or weight loss: 1–2 mg weekly for Ozempic, up to 2.4 mg weekly for Wegovy.
- T1D off-label use: Lower doses (0.25–0.5 mg weekly) are often more appropriate to minimize risk of hypoglycemia or ketones.
- My experience: Since 2018, Ozempic has helped me manage appetite, reduce insulin resistance, and smooth post-meal spikes. But it required slow titration and close monitoring.
GLP-2: The Gut Healer
- What it does: Repairs the intestinal lining, improves nutrient absorption, and strengthens gut barrier function.
- Medication: Teduglutide (Gattex), FDA-approved for short bowel syndrome.
- T1D role: Not used for glucose control, but it could one day support those with T1D and gut conditions like celiac.
GLP-3: Still in the Lab
- What it does: A research peptide fragment with no established clinical role.
- Medication: None.
- T1D role: None.
Tirzepatide vs. Ozempic: What’s the Difference?
Here’s where it gets interesting. Many people lump tirzepatide in with GLP peptides, but it’s not just a GLP-1 drug. If you hop in many T1D Facebook groups and see how T1Ders are using these 2 meds, you will see they work for both, but after a breif skim, comments can suggest more weight loss is had with Tirepatide. Let’s break it down…
Ozempic (semaglutide)
- Class: GLP-1 receptor agonist
- Effects: Lowers blood sugar, slows digestion, reduces appetite
- FDA Approval: Type 2 diabetes (Ozempic), weight loss (Wegovy)
- T1D: Off-label, lower doses sometimes used for appetite and glucose support
Tirzepatide (Mounjaro / Zepbound)
- Class: Dual agonist (GLP-1 receptor + GIP receptor)
- Effects: Same benefits as GLP-1 drugs plus additional GIP activity, which may enhance insulin sensitivity and boost weight loss further
- FDA Approval: Type 2 diabetes (Mounjaro), weight loss (Zepbound)
- T1D: Also off-label; being studied for potential benefits, but not FDA-approved
Key Difference: Ozempic works only on GLP-1 receptors, while tirzepatide works on both GLP-1 and GIP. That dual action seems to make tirzepatide more effective for weight loss and improving insulin sensitivity—but it doesn’t change the fact that neither drug replaces insulin in T1D, and obtaining insurance coverage for either may require extra effort.
Why This Matters for T1D
- Insulin will always be the foundation. Nothing replaces it.
- GLP-1 drugs like Ozempic can be helpful adjuncts for those with weight struggles or insulin resistance, but they require cautious, lower dosing.
- Tirzepatide may offer even more weight/metabolic benefits, but research in T1D is still early, and it’s also off-label.
- GLP-2 and experimental peptides may have gut-health relevance, but aren’t part of today’s T1D care.
My Bottom Line
Living with T1D means you’re already in the peptide world—insulin is the hero. GLP-1s (like Ozempic) and dual agonists (like tirzepatide) can play supporting roles, but they’re not magic, and they’re not for everyone.
The key is this: dosing for T1D isn’t the same as for weight loss. It usually means starting lower, watching patterns carefully, and adjusting insulin thoughtfully with your care team.
So when you hear the hype about peptides, remember: some are science-backed, some are still experimental, and some are just cosmetic. The real power is knowing what’s relevant for your body—and giving yourself grace as you navigate the options.
If you’d like to talk more about GLPs or how I work with clients, book a time with me soon. I’d love to connect and help you on this wild ride called life with T1D!
