Supplement Guide · Updated March 2026

Best Supplements to Take on GLP-1 Medications (Tested With DEXA Scans)

I have been tracking my body composition with DEXA scans since starting Mounjaro (started at ~195 lbs, currently ~181 lbs, 21.9% body fat). Along the way, I tested several supplements to see what actually moved the needle on muscle preservation, side effect management, and overall health. Here are the best supplements for GLP-1 medications, ranked by evidence and real-world results.

When I started Mounjaro, I did what everyone does: I Googled “what supplements should I take on GLP-1s” and found dozens of lists that all said the same vague things. Take a multivitamin. Drink more water. Consider protein.

None of those articles had any data behind them. No one was tracking body composition changes. No one was measuring whether specific supplements actually made a difference.

So I started tracking. I got DEXA scans, kept a supplement log, and paid attention to what changed when I added or removed things from my stack. This is not a clinical trial. It is one person’s experience over several months, backed by whatever research I could find. Take it for what it is.

The Best Supplements for GLP-1 Medications, Ranked

Before I go through each one individually, here is the summary table. I ranked them by evidence strength, how much of a difference I noticed personally, cost, and whether I consider them a high, medium, or low priority for someone on a GLP-1.

Now the details on each one.

Creatine Monohydrate: The Strongest Case

Dose: 3-5g per day. No loading phase needed.

If you only add one supplement while on a GLP-1, make it creatine monohydrate. The evidence base is larger than any other supplement on this list, and it directly addresses the biggest concern for GLP-1 patients: muscle loss.

Here is what the research shows. A 2022 meta-analysis in the Journal of the International Society of Sports Nutrition (Kreider & Stout) reviewed over 500 studies and confirmed that creatine supplementation during resistance training increases lean mass, strength, and exercise performance. During calorie restriction specifically, creatine has been shown to help preserve muscle that would otherwise be lost.

No one has run a trial combining creatine with GLP-1 medications specifically. But the mechanism is straightforward. Creatine increases water retention in muscle cells (which is not the same as bloating), supports ATP regeneration during resistance training, and may have direct anti-catabolic effects. All of these matter when you are in a calorie deficit from appetite suppression.

My experience: I added creatine at month two of Mounjaro. My DEXA scan results at six months showed that lean mass accounted for only about 13.4% of my total weight loss, compared to the 34% average in the SURMOUNT-1 trial. I was also lifting weights and eating high protein, so I cannot isolate creatine’s effect. But the combined protocol clearly worked.

What to buy: Plain creatine monohydrate powder. Nothing fancy. The brand does not matter. Skip creatine HCl, buffered creatine, and anything marketed as “advanced formula” with a 300% markup. Monohydrate is the form used in virtually every study.

Cost: About $8-12/month for 5g daily.

One note: Creatine pulls water into muscle cells, which means the scale might go up 2-4 lbs when you start. This is not fat gain. It is intracellular water, and it actually makes your muscles look fuller. If you are tracking progress by scale weight alone, be aware of this. Better yet, use our body composition calculator or get a DEXA scan to track what actually matters.

Whey Protein: Hitting Your Targets When Appetite Is Gone

Target: 0.7-1.0g protein per pound of body weight per day.

This is less of a “supplement” and more of a dietary necessity that becomes nearly impossible without supplementation on a GLP-1. The appetite suppression from medications like Mounjaro and Ozempic makes eating enough protein genuinely difficult. Some days I could barely manage 1,200 calories of solid food. Without protein shakes, there is no way I would have hit 150-170g of protein on those days.

Why protein matters this much: the research on protein intake during calorie restriction is extremely clear. A 2024 analysis in Diabetes, Obesity and Metabolism (Neeland et al.) confirmed that higher protein intake during GLP-1 treatment improves the lean-to-fat loss ratio. I covered this in detail in my guide on GLP-1 exercise and muscle preservation.

What works for GLP-1 patients specifically:

• Whey isolate is easier on the stomach than concentrate. This matters when nausea is already a common side effect.
• Clear whey (the juice-like protein drinks) can be easier to get down when the thought of a thick milkshake makes you gag. I used these heavily during the 7.5mg nausea phase.
• Casein protein before bed if you can tolerate it. Slower digestion means overnight amino acid supply.

My daily approach: Two protein shakes (50-60g total), plus whatever protein I could get from meals. On bad nausea days, the shakes were sometimes all I managed for protein. On better days, I aimed for chicken, Greek yogurt, or eggs at every meal and used the shakes to top off.

Cost: $30-50/month depending on brand. Store-brand whey isolate from Costco or Amazon is fine.

Electrolytes: The Underrated Essential During Dose Titration

Key minerals: sodium, potassium, magnesium.

Electrolyte supplementation does not get enough attention in the GLP-1 space, but it should. When you eat dramatically less food, you take in dramatically fewer electrolytes. Add nausea, vomiting, or diarrhea from dose increases, and you can deplete your electrolyte stores fast.

The symptoms of low electrolytes overlap with GLP-1 side effects in ways that confuse people. Muscle cramps, fatigue, headaches, dizziness, brain fog. I spent three weeks blaming Mounjaro for what turned out to be a magnesium deficiency. Once I added an electrolyte supplement, the muscle cramps disappeared within days.

What helped me:

• Magnesium glycinate (200-400mg before bed). Glycinate is the form least likely to cause GI issues, which matters when your gut is already irritated. It also promotes better sleep.
• Sodium: I added a pinch of salt to my morning water. Sounds simple, but when you are eating 1,200-1,500 calories, you are probably not getting enough sodium from food alone.
• Potassium: I used a potassium-containing electrolyte powder (like LMNT or a similar product) rather than standalone potassium supplements, which can cause stomach upset.

When to pay extra attention: During dose titration. Every time you increase your Mounjaro dose, the nausea and appetite suppression tend to spike for 1-2 weeks. That is when electrolyte depletion is most likely.

Cost: $15-25/month for a quality electrolyte powder.

Vitamin D + K2: Protecting Bones During Weight Loss

Dose: 2,000-5,000 IU Vitamin D3 daily, plus 100-200mcg K2 (MK-7 form).

Vitamin D deficiency is common in the general population. A 2024 report from the Endocrine Society estimated that roughly 35% of US adults have vitamin D levels below 20 ng/mL (clinical deficiency) and up to 50% are below the optimal threshold of 30 ng/mL. When you are losing weight rapidly on a GLP-1, bone health becomes a real consideration.

Weight loss from any method reduces mechanical loading on your skeleton. Less body weight means less stimulus for bone maintenance. The SURMOUNT-1 trial data showed small but measurable decreases in bone mineral density in the tirzepatide group. My own DEXA showed a slight drop in bone mineral content (8.0 lbs baseline to 7.8 lbs at six months).

Vitamin D supports calcium absorption, which is critical for maintaining bone density during weight loss. K2 (specifically the MK-7 form) directs that calcium into your bones and teeth rather than your arteries. They work together, and most vitamin D supplements sold today include K2 for this reason.

Get your levels tested. This is one supplement where the dose should match your actual blood level. Ask your doctor for a 25-hydroxyvitamin D test. If you are below 30 ng/mL, you likely need supplementation.

Cost: $10-15/month for a D3+K2 combo supplement.

Omega-3 Fish Oil: Worth It, But Not the Top Priority

Dose: 1-2g combined EPA/DHA per day.

Fish oil has solid evidence for reducing inflammation markers and supporting joint health. Both of those are relevant for GLP-1 patients. Rapid weight loss can stress your joints as your body adjusts, and systemic inflammation tends to be elevated in people with obesity (which is why most GLP-1 patients started the medication in the first place).

A 2019 meta-analysis in Advances in Nutrition (Guo et al.) found that omega-3 supplementation modestly reduced markers of inflammation including CRP and IL-6 in adults with overweight and obesity. The effect is not dramatic, but it is consistent across studies.

I rank this as medium priority because most of the inflammation reduction on GLP-1s comes from the weight loss itself. Visceral fat is a major source of inflammatory cytokines, and GLP-1 medications disproportionately reduce visceral fat. My own visceral fat dropped from 187 cm2 to 94 cm2 over six months (details in my DEXA results write-up). That alone did more for inflammation than any fish oil capsule could.

That said, if you have a history of joint pain or elevated inflammatory markers, fish oil is a reasonable addition.

What to look for: At least 500mg EPA and 250mg DHA per serving. Third-party tested for mercury and oxidation (IFOS certification is the gold standard). Avoid the cheap dollar-store fish oil that tastes like a marina.

Cost: $15-25/month for a quality brand.

Fiber Supplement: Managing the Most Common GI Side Effect

Dose: Start with 5g daily, increase to 10-15g as tolerated.

Constipation is one of the most common side effects of GLP-1 medications. In the SURMOUNT-1 trial, 11.7-17.1% of tirzepatide patients reported constipation compared to 5.8% on placebo. For semaglutide, the STEP trials showed constipation rates of 24.2%.

This makes sense physiologically. GLP-1 receptor agonists slow gastric emptying (that is partly how they reduce appetite). Slower gut motility means slower transit, which means constipation. Add reduced food intake (less dietary fiber coming in) and potential dehydration, and you have a perfect storm.

What works:

• Psyllium husk (Metamucil or generic) is the most studied fiber supplement and the one I used. Start low (one teaspoon in water) and build up. Adding too much fiber too fast will make the GI issues worse, not better.
• Take it with plenty of water. Fiber without water can make constipation worse. Aim for at least 8-12 oz when you take it.
• Time it away from medications. Fiber can slow the absorption of some medications. Take it at least 2 hours before or after your other supplements.

I did not need fiber supplementation every day. It was most useful during the first 2-3 weeks after each dose increase, when the GI slowdown was most pronounced. Once my body adjusted to each dose level, things normalized.

Cost: $10-15/month for psyllium husk powder.

Multivitamin: The Insurance Policy

My take: Low priority, but not zero.

A multivitamin is the least exciting supplement on this list, and the one with the weakest case for a specific effect. But there is a practical argument for it. When you are eating 1,200-1,500 calories a day (which is common on GLP-1s, especially during dose increases), you are probably not getting the full range of micronutrients from food alone.

The research on multivitamins for healthy adults is underwhelming. Most large trials (including the Physicians’ Health Study II) show no significant benefit for cancer, cardiovascular disease, or mortality. But those trials studied people eating normal amounts of food. The situation is different when calorie intake drops by 30-50%.

I take a basic one-a-day multivitamin as a safety net. It is not the reason my DEXA results look good. It is not treating any specific deficiency. It is a cheap hedge against the reality that I am eating a lot less than I used to.

What to avoid: Mega-dose multivitamins with 500% of the daily value for everything. Your body cannot use those amounts. It just excretes the excess (expensive urine). A basic one-a-day with roughly 100% of most micronutrients is all you need.

Cost: $10-20/month.

What NOT to Take on GLP-1 Medications

This section matters just as much as the recommendations above. There is a growing market of supplements targeting GLP-1 users, and most of it ranges from useless to potentially harmful.

Fat Burners and Thermogenics

You are already in a significant calorie deficit from the medication. Adding stimulant-based fat burners (caffeine, synephrine, yohimbine) on top of reduced food intake is a recipe for heart palpitations, anxiety, and feeling terrible. The fat loss is already happening. Trying to accelerate it with thermogenics while eating 1,200 calories is unnecessary and risky.

Appetite Suppressants

Taking an appetite suppressant alongside a GLP-1 (which is itself the most powerful appetite suppressant most people will ever use) makes no sense. Your appetite is already suppressed. The challenge is eating enough, not eating less. Double-suppressing your appetite increases the risk of malnutrition and excessive muscle loss.

If you are struggling with appetite on a GLP-1 and considering adding another suppressant, that is a sign to talk to your doctor about your dosing, not to add another pill. See our Mounjaro dosage guide for how dose titration affects appetite.

”GLP-1 Booster” Supplements

A new category of supplements has appeared in 2025-2026 claiming to “boost your body’s natural GLP-1 production” or “enhance GLP-1 receptor sensitivity.” Most contain berberine, chromium, or proprietary blends of plant extracts.

The claims are not supported by any meaningful clinical evidence. Berberine does have some data for blood sugar management, but calling it a “GLP-1 booster” is a stretch at best. If you are already on a pharmaceutical GLP-1 receptor agonist, your receptors are already being stimulated at a level that no supplement can match.

Save your money. The supplements that actually help GLP-1 patients are the boring, well-studied ones listed above.

Detox and Cleanse Products

No. These have never had evidence behind them for any population. They are even less appropriate for someone on medication that already slows gastric emptying. Skip them entirely.

My Current Supplement Stack on Mounjaro

For transparency, here is exactly what I take daily as of March 2026, at ~181 lbs and 21.9% body fat:

• Creatine monohydrate: 5g in morning water
• Whey protein isolate: 2 shakes per day (50-60g total protein from shakes)
• Electrolyte powder: 1 serving in morning water (contains sodium, potassium, magnesium)
• Magnesium glycinate: 200mg before bed
• Vitamin D3 + K2: 4,000 IU D3 + 100mcg K2, taken with breakfast
• Fish oil: 1g combined EPA/DHA with breakfast
• Psyllium husk: As needed during dose titration weeks (not daily)
• Basic multivitamin: One daily

Total monthly cost: roughly $100-130. Not cheap, but not unreasonable for someone spending $150-400/month on the medication itself. If budget is tight, prioritize creatine and protein first. Everything else is secondary. For help finding the most affordable GLP-1 providers, see our pricing comparison.

The Bottom Line

The best supplements for GLP-1 medications are not exotic or complicated. Creatine, protein, and electrolytes address the three biggest challenges you face on these drugs: muscle loss, inadequate protein intake, and mineral depletion from eating less. Vitamin D, omega-3, fiber, and a multivitamin fill in the gaps depending on your individual situation.

What I would not do is spend money on fat burners, appetite suppressants, or anything marketed specifically as a “GLP-1 booster.” The medication is doing the heavy lifting. Your job is to protect your muscle, manage the side effects, and keep your nutrition as solid as possible on reduced calories.

If you want to track whether your supplement protocol is actually working, get a DEXA scan. The scale alone will not tell you. I cover exactly what to expect from that process in my DEXA scan results after six months on Mounjaro. And if you are still choosing a GLP-1 provider, our provider directory compares pricing and programs side by side.

FAQ

Do I need supplements on Ozempic or Mounjaro?

You do not technically “need” any supplements, but the reduced calorie intake from GLP-1 medications makes it very hard to get enough protein and micronutrients from food alone. Creatine and protein powder address the muscle loss concern specifically. Electrolytes help with the side effects most people experience during dose increases. Talk to your doctor about what makes sense for your situation.

Does creatine cause weight gain on GLP-1 medications?

Creatine pulls water into muscle cells, which can add 2-4 lbs to the scale in the first 1-2 weeks. This is water, not fat. It does not slow or counteract the fat loss from your GLP-1 medication. If you are tracking body composition with a DEXA scan or our body composition tool, this water weight shows up as lean mass, which is where you want it.

Can supplements help with GLP-1 nausea?

Electrolytes (especially magnesium) and ginger may help reduce nausea during dose increases. Staying hydrated is more important than any single supplement. Fiber can help with constipation, another common GLP-1 side effect. For a full breakdown of side effects by month and what helps, see our dedicated guide.

How much protein should I eat on a GLP-1 medication?

Aim for 0.7-1.0 grams of protein per pound of body weight per day. For a 180 lb person, that is 126-180g daily. Most GLP-1 patients struggle to hit this target through food alone because of appetite suppression. Protein shakes (whey isolate or clear whey) are the most practical way to close the gap. For more on protein and exercise strategy, see our guide on GLP-1 exercise and muscle preservation.

Are “GLP-1 booster” supplements worth buying?

No. Products marketed as “natural GLP-1 boosters” or “GLP-1 enhancers” have no meaningful clinical evidence. If you are already on a pharmaceutical GLP-1 receptor agonist like semaglutide or tirzepatide, your receptors are being stimulated at a level that no supplement can replicate. Save your money for creatine, protein, and electrolytes, which have actual evidence behind them.

Related

Guides:

• Cheapest GLP-1 Online · Insurance Coverage · Side Effects
• Mounjaro Dosage Guide · Oral vs Injectable · Exercise and Muscle
• Fat Loss vs Weight Loss · DEXA Scan Results · Mounjaro Plateau · Medicare Coverage · Wegovy Pill vs Injection

Provider Reviews: Ro · Hims · MEDVi · Found · Calibrate

Compare: All Providers · Best GLP-1 Programs · All Guides