Best Supplements to Take With a GLP-1 (and Why)
Key takeaways
- GLP-1 medications sharply reduce appetite, so the goal of most "companion" supplements is to protect what you can lose on the way down, chiefly muscle, bone, and hydration.
- Protein has the strongest rationale, because meaningful weight loss on any method can take lean body mass with it unless intake and resistance training keep pace.
- Creatine, vitamin D, calcium, electrolytes, fiber, and omega-3 are reasonable, well-studied basics, though the evidence for each is general nutrition science, not GLP-1-specific.
- Standardized Urolithin A is an emerging option studied for mitochondrial and muscle-strength support in humans; promising, but still early.
- Supplements are complements, not substitutes, for the medication, food, or medical follow-up. Interactions and timing matter, so talk to your prescriber or pharmacist.
Why supplements come up at all with GLP-1s
GLP-1 receptor agonists work largely by curbing appetite and slowing gastric emptying. That is the point, and it is why they are effective. But eating much less has predictable knock-on effects: you take in fewer calories, less protein, fewer micronutrients, and sometimes less fluid, all while your body is actively remodeling. Two issues dominate the conversation.
First, lean mass. When people lose weight quickly by any route, a share of that loss is muscle, not just fat. A clinical review of GLP-1-based therapies found that lean body mass often accounts for a meaningful portion of total weight lost, and it flags nutrition and resistance exercise as the primary mitigation strategies (review of lean body mass changes with GLP-1-based therapies, Diabetes, Obesity and Metabolism, 2024). A broader review specific to obesity treatment reaches the same practical conclusion: protein adequacy, training, targeted supplementation, and monitoring are the levers that help preserve the musculoskeletal system during treatment (Šantić et al., Metabolites, 2026). If you want the bigger picture on why the composition of weight lost matters, our article on how to preserve muscle on a GLP-1 goes deeper on training and meal planning.
Second, tolerability. Nausea, vomiting, diarrhea, and constipation are among the most common GLP-1 side effects, and they can nudge hydration, electrolytes, and fiber into the "worth addressing" column (Sodhi et al., JAMA 2023, GI adverse events with GLP-1 agonists). None of this is a reason to fear the medication. It is a reason to eat and supplement deliberately.
The supplements worth understanding
Protein — the non-negotiable
If you do only one thing on this list, prioritize protein. When appetite drops, protein is usually the first macronutrient to fall short, and it is the one most tied to preserving muscle during weight loss. Whether you use whole foods, a protein powder, or both, the aim is to hit an adequate daily target spread across meals, paired with some resistance training. The 2026 Metabolites review notes that GLP-1 consensus documents commonly suggest around 1.2 to 1.5 g of protein per kg of actual body weight per day during active weight loss, alongside a pragmatic minimum of two to three resistance sessions a week targeting the major muscle groups (Šantić et al., 2026). Your own number may differ, especially with kidney disease, so confirm it with your clinician or a dietitian. When appetite is low, protein-first meals, Greek yogurt, eggs, fish, tofu, and a shake on low-appetite days make the target far easier to reach. This is where evidence and consensus are strongest, and it is the foundation everything else builds on.
Creatine — strength support, well-studied
Creatine monohydrate is one of the most researched sports-nutrition ingredients, with a long track record for supporting strength and training performance. The International Society of Sports Nutrition's position stand concludes it is effective and safe for increasing high-intensity exercise capacity and lean mass when combined with training (ISSN position stand on creatine). The usual maintenance amount discussed is about 3 to 5 g of creatine monohydrate a day, taken daily including rest days; the 2026 Metabolites review notes that direct data in GLP-1-treated patients are still absent, so treat it as a general training aid that may complement your resistance work, not a GLP-1 remedy. Creatine can also draw water into muscle, another reason to stay hydrated.
Vitamin D and calcium — bone and muscle basics
Rapid weight loss and lower food intake put bone health on the radar, and vitamin D and calcium are the two nutrients most associated with it. Vitamin D supports calcium absorption and normal muscle function, and deficiency is common even without weight loss (NIH ODS vitamin D fact sheet). Calcium needs are easy to miss when you are eating less overall (NIH ODS calcium fact sheet). These are maintenance nutrients: get levels checked rather than mega-dosing blindly, since more is not better with either.
Electrolytes and hydration — practical, not glamorous
Eating and drinking less, plus occasional vomiting or diarrhea, can leave people under-hydrated and low on sodium, potassium, and magnesium. There is no GLP-1-specific electrolyte trial to cite here, so the rationale is physiological common sense: replace fluids and electrolytes when intake drops or GI symptoms flare. Plain water plus food usually covers most people; an electrolyte mix can help on rough days. If you have kidney, heart, or blood-pressure conditions, this is a conversation for your clinician before you start.
Fiber — for GI comfort and regularity
Constipation is a frequent GLP-1 complaint, partly because less food and less fluid means less to move through the gut. Adequate fiber, introduced gradually and with enough water, is the standard first-line approach to regularity. Go slowly: adding a large fiber dose too fast can worsen bloating, and fiber can affect how some medications are absorbed, so separate it from your other pills and ask your pharmacist about timing.
Omega-3 — a general-health staple
Omega-3 fatty acids (EPA and DHA) are widely used for general cardiovascular and metabolic support, and most people fall short of recommended intakes from diet alone (NIH ODS omega-3 fact sheet). There is no GLP-1-specific claim to make here; it is simply a reasonable nutritional gap-filler when fish intake is low. Higher doses can thin the blood, so mention it to your prescriber if you take anticoagulants or are heading into surgery.
Standardized Urolithin A — emerging mitochondrial and muscle support
Urolithin A is a compound your gut can produce from certain foods, but many people make little of it, which is why standardized supplemental forms exist. It is studied for supporting mitochondrial function, the cellular machinery muscles rely on. A randomized trial in middle-aged adults (HUMAN) reported improvements in leg muscle strength alongside changes in biomarkers of mitochondrial health, though grip strength and VO2 max did not change (Singh et al., Cell Reports Medicine, 2022), and a randomized study in older adults (HUMAN) found benefits for muscle endurance and mitochondrial biomarkers while missing its primary walking endpoint (Liu et al., JAMA Network Open, 2022). A 2026 systematic review of the randomized trials rated the overall muscle evidence as directionally favorable but statistically inconclusive (Dao et al., Frontiers in Nutrition, 2026). The evidence is genuinely promising but still early and not GLP-1-specific, so treat it as a supportive addition rather than a proven muscle-loss fix. Our page on urolithin A and GLP-1 medications covers timing and what to ask your prescriber. For a consistent, standardized dose, our SOMA Urolithin A gummies deliver 1,000 mg per serving.
Quick-reference table
| Supplement | Why it's considered with a GLP-1 | Evidence note |
|---|---|---|
| Protein | Preserve muscle when appetite and intake drop | Strong; the priority for anyone losing weight |
| Creatine | Support strength and training alongside resistance work | Strong for strength generally; not GLP-1-specific |
| Vitamin D + calcium | Bone and muscle maintenance during weight loss | Well-established nutrients; test, don't over-dose |
| Electrolytes / hydration | Offset low fluid intake, vomiting, or diarrhea | Practical rationale; limited direct trial evidence |
| Fiber | Ease constipation and support regularity | Standard first-line for GI comfort; add gradually |
| Omega-3 | Fill a common dietary gap for general health | General support; not GLP-1-specific |
| Standardized Urolithin A | Mitochondrial and muscle-strength support | Promising human RCTs; early and not GLP-1-specific |
How to think about stacking (and safety)
You do not need all seven. A sensible order of operations is: nail protein and hydration first, add fiber if you are getting constipated, cover vitamin D and calcium based on testing, and then consider creatine, omega-3, or standardized Urolithin A as targeted extras that fit your goals. Introduce one thing at a time so you can tell what is helping.
A few honest guardrails. Supplements complement your medication, food, and follow-up care; they do not replace any of them. Slowed gastric emptying and low intake can change how pills, fiber, and supplements are tolerated and absorbed, so timing matters. And several items here interact with common medications, blood thinners, blood-pressure and kidney considerations, and more. Before adding anything, review your full list with your prescriber or pharmacist so it fits your specific situation.
Frequently asked questions
What is the single most important supplement to take with a GLP-1?
Protein, by a wide margin, ideally paired with some resistance training. When appetite drops, protein intake usually falls first, and it is the nutrient most linked to preserving muscle during weight loss. Everything else on this list is secondary to getting enough protein consistently.
Will supplements stop me from losing muscle on a GLP-1?
No supplement can promise that. Some muscle loss can accompany significant weight loss by any method. Adequate protein and resistance training are the best-supported ways to blunt it, and ingredients like creatine and standardized Urolithin A are studied for muscle and mitochondrial support. Think of it as reducing the odds, not eliminating them.
Are there interactions between these supplements and GLP-1 medications?
GLP-1 drugs slow gastric emptying, which can affect how supplements and other oral medications are tolerated and absorbed, and several items here (omega-3, electrolytes, fiber) carry their own cautions. There is no one-size-fits-all answer, which is exactly why you should run your list past your prescriber or pharmacist.
Is Urolithin A worth taking with a GLP-1?
It is a reasonable, evidence-graded option if your goal is mitochondrial and muscle-strength support. Human randomized trials show encouraging results, but the research is still early and was not done specifically in GLP-1 users, so treat it as a supportive addition rather than a proven fix for medication-related muscle loss.
Do I need to take all of these?
No. Most people do well starting with protein and hydration, adding fiber if constipated, and covering vitamin D and calcium based on lab testing. Creatine, omega-3, and standardized Urolithin A are optional extras you can layer in one at a time, based on your goals and your clinician's input.
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