Foundational Support for GLP-1 Users
IGF-1, growth factors, and gut-healing compounds that may help preserve lean mass and support digestive comfort, alongside your medication, not instead of it.
"I'm on Ozempic (or Wegovy, Mounjaro, Zepbound), will colostrum help with the muscle loss and stomach issues?" is a question we're hearing more and more, and it deserves a straight answer.
Colostrum does not affect how GLP-1 medications work, and it is not a treatment for their side effects. It does not change drug absorption, appetite signaling, or blood sugar control. If you're looking for something that directly counteracts a medication's mechanism, colostrum is not that.
What colostrum does have is clinical evidence for two things that happen to overlap almost exactly with the two most common concerns GLP-1 users raise: lean mass preservation and gut barrier support. Here is what the research actually shows, and how it may fit alongside a GLP-1 regimen.
What GLP-1 Medications Actually Do to the Body
Semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound), and similar drugs work by mimicking gut hormones that suppress appetite and slow gastric emptying. That mechanism is highly effective for weight loss, but it comes with two well-documented tradeoffs.
Lean Mass Loss
A 2024 commentary in The Lancet Diabetes & Endocrinology found that 25–39% of total weight lost on GLP-1 receptor agonists comes from fat-free (lean) mass, several times faster than the muscle loss expected from aging alone.
GI Side Effects
Slowed gastric emptying causes nausea, bloating, constipation, and reflux in a large share of users. A 2025 review in the Journal of Clinical Endocrinology & Metabolism documented these motility effects as a direct consequence of the drug class.
Neither of these is a reason to avoid GLP-1 medications, they are effective, medically supervised tools. But both are reasons people are looking for supportive strategies, and this is where colostrum's two most-researched mechanisms become relevant.
Colostrum and Lean Mass Preservation
Bovine colostrum is the richest natural dietary source of IGF-1 (insulin-like growth factor 1), a signaling molecule that promotes muscle protein synthesis and inhibits muscle protein breakdown. This is the same mechanism behind colostrum's researched role in body composition, distinct from any fat-loss effect.
A randomized trial in active men and women published in Nutrition compared 8 weeks of bovine colostrum supplementation (20g/day) to a whey protein control during combined aerobic and resistance training. The colostrum group gained significantly more bone-free lean body mass (+1.49kg), while body weight gains in the whey group came from other tissue.
For someone on a GLP-1 medication, where 25–39% of total weight lost may be lean mass, anything that supports the muscle-building side of the equation is worth understanding, though colostrum is a supportive input, not a substitute for the two interventions with the strongest evidence for preventing lean mass loss during GLP-1 therapy: adequate protein intake and resistance training. For a deeper look at colostrum's body composition research outside the GLP-1 context, see Can Colostrum Help With Weight Loss? What the Research Shows.
Colostrum and Gut Comfort
Colostrum contains growth factors, including EGF (epidermal growth factor) and TGF-β (transforming growth factor beta), that have been studied for their role in supporting and repairing the gut lining. This is a different mechanism than anything that affects gastric emptying speed, colostrum does not accelerate or slow stomach motility.
A study published in Gut found that bovine colostrum supplementation helped protect the gut lining from NSAID-induced damage, and a systematic review in Nutrition Reviews summarized decades of clinical research on colostrum's role in supporting gut barrier integrity.
Important distinction: Colostrum does not treat GLP-1-related nausea, gastroparesis, or reflux. Those are motility side effects caused by the medication itself. What colostrum may support is general gut lining integrity, a different and complementary target, not a fix for slowed gastric emptying.
Does Colostrum Interact With GLP-1 Medications?
There are no published studies examining colostrum supplementation specifically alongside semaglutide, tirzepatide, or other GLP-1 receptor agonists, and no known mechanism by which colostrum would interfere with how these medications work. Colostrum is a food-derived supplement, not a drug, and does not affect the receptors GLP-1 medications target.
That said, because GLP-1 medications already slow digestion, introducing any new supplement is worth doing thoughtfully. Talk to your prescribing doctor or a registered dietitian before adding colostrum, particularly if you are also managing diabetes, taking other medications, or experiencing significant GI side effects already. If you do get the go-ahead, our Colostrum Dosage Guide covers general serving sizes and how to start low.
Realistic vs. Unrealistic Expectations
✓ What Colostrum Realistically Supports
- Lean mass preservation: A supportive input alongside protein intake and resistance training, the two interventions with the strongest evidence base
- Gut lining integrity: General digestive support, separate from medication-induced motility changes
- Recovery from training: Useful if you're combining a GLP-1 regimen with resistance training to protect lean mass
✗ What Colostrum Does Not Do
- Reduce nausea or gastroparesis: No evidence colostrum affects gastric emptying speed or GLP-1-related GI symptoms
- Replace protein or resistance training: Both have stronger, more direct evidence for preventing lean mass loss on GLP-1 medications
- Interact with or enhance the medication: Colostrum does not affect GLP-1 drug mechanism, dosing, or efficacy
- Substitute for medical guidance: Any supplement decision while on a GLP-1 medication should involve your prescribing provider
Who This Is Most Relevant For
- People on a GLP-1 medication prioritizing muscle preservation, especially when combined with resistance training and adequate protein intake
- People whose GI side effects have stabilized and who are looking for general gut-supportive nutrition, not acute symptom relief
- Older adults on GLP-1 therapy, where age-related lean mass decline compounds the medication's effect on muscle
The Bottom Line
Colostrum is not a GLP-1 side-effect treatment and does not interact with how these medications work. What the evidence does support is that colostrum's IGF-1 and growth factor content may help support lean mass, and its gut-barrier compounds may support general digestive health, both relevant to the two most common concerns GLP-1 users raise.
If muscle preservation is your priority, protein intake and resistance training remain the foundation, and colostrum can be a supportive addition. If GI side effects are significant, that conversation belongs with your prescribing provider first. Used this way, colostrum is best understood as a foundational support supplement alongside a GLP-1 regimen, not a replacement for any part of it.
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as medical advice. These statements have not been evaluated by the Food and Drug Administration. Our products are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen, especially if you are pregnant, nursing, have a medical condition, or are taking medications.
References & Scientific Sources
- Antonio J, Sanders MS, Van Gammeren D. "The effects of bovine colostrum supplementation on body composition and exercise performance in active men and women." Nutrition. 2001;17(3):243-247. https://doi.org/10.1016/S0899-9007(00)00552-9
- Prado CM, et al. "Muscle matters: the effects of medically induced weight loss on skeletal muscle." The Lancet Diabetes & Endocrinology. 2024;12(11):785-787. https://doi.org/10.1016/S2213-8587(24)00272-9
- Look M, et al. "Body composition changes during weight reduction with tirzepatide in the SURMOUNT-1 study of adults with obesity or overweight." Diabetes, Obesity and Metabolism. 2025. https://doi.org/10.1111/dom.16275
- Alissou N, et al. "Impact of Semaglutide on fat mass, lean mass and muscle function in patients with obesity: The SEMALEAN study." Diabetes, Obesity and Metabolism. 2026. https://doi.org/10.1111/dom.70141
- Jalleh RJ, et al. "Clinical Consequences of Delayed Gastric Emptying With GLP-1 Receptor Agonists and Tirzepatide." The Journal of Clinical Endocrinology & Metabolism. 2025;110(1):1-15. https://doi.org/10.1210/clinem/dgae719
- Playford RJ, et al. "Bovine colostrum is a health food supplement which prevents NSAID induced gut damage." Gut. 1999;44(5):653-658. https://doi.org/10.1136/gut.44.5.653
- Rathe M, et al. "Clinical applications of bovine colostrum therapy: a systematic review." Nutrition Reviews. 2014;72(4):237-254. https://doi.org/10.1111/nure.12089