I want to put the uncomfortable part at the top, because it is the part that decides whether anything else on this page is worth your money.
Supplements are the third most important thing you can do about muscle loss on a GLP-1. Resistance training is first. Protein intake is second. The gap between them and everything below is not close.
What the body composition data actually shows
Somewhere between a quarter and 40% of the weight lost on these drugs is lean tissue.
That number sounds alarming until you learn it is roughly what happens in any rapid weight loss — dieting, bariatric surgery, illness. Losing fat without losing some lean mass is difficult under any circumstance and impossible to achieve by supplement.
What is different here is the speed and the appetite suppression, which together remove the two things that normally protect lean mass: enough protein, and enough energy to train.
Ranked · muscle-preservation supplements for GLP-1 users
How this was ordered: Strength of evidence for preserving lean mass during caloric restriction specifically, not for building muscle in a surplus; full clinical dosing; and whether the format survives contact with a suppressed appetite. Protein and resistance training are assumed as the baseline, not counted as competitors.
| # | Product | Key spec | Price | Best for |
|---|---|---|---|---|
| 1 | GLP-1 FoundationMinome | 5,000 mg creatine monohydrate + electrolytes | $39.99/mo sub | The single best-evidenced supplement, plus hydration |
| 2 | Gold Standard 100% WheyOptimum Nutrition | 24 g protein per scoop · Informed Choice | ~$1.10/serving (~$33/mo) | Anyone under their protein target |
| 3 | CreatineThorne | 5,000 mg monohydrate · NSF Certified for Sport | ~$0.50/serving (~$15/mo) | Certified creatine, minimum spend |
| 4 | Creatine HMBTransparent Labs | 5,000 mg creatine + 1,500 mg HMB | ~$0.83/serving (~$25/mo) | The anti-catabolic theory |
| 5 | Essential Grass-Fed Whey ProteinMomentous | 20 g protein · NSF Certified for Sport | ~$2.20/serving (~$66/mo) | Tested athletes who want protein |
1. GLP-1 Foundation
Creatine monohydrate at a full 5 g is the most defensible supplement purchase anyone on these drugs can make, and this is the version built for the context — the electrolytes underneath it address the dehydration that otherwise wrecks training quality in the titration weeks. One scoop, once daily, which matters when swallowing anything has become a negotiation.
Against it Roughly triple the price of plain monohydrate, and no NSF or Informed Sport certification. It does nothing for protein intake, which for many readers is the larger deficit.
2. Gold Standard 100% Whey
If you are not hitting 1.2 to 1.6 g of protein per kilogram, this outranks everything else on the page including the pick above it. Liquid protein bypasses the volume problem entirely, which is the specific reason GLP-1 users miss the target.
Against it It is food, not pharmacology, and it competes for the small amount of appetite you have. Whey also sits heavily in a stomach that is already emptying slowly.
3. Creatine
The same molecule as the top pick, independently certified, at a third of the price. If hydration is not a problem for you, this is the efficient answer.
Against it Bare creatine and nothing else. You will likely end up buying electrolytes separately.
4. Creatine HMB
HMB has a genuinely plausible mechanism during caloric restriction — it is a leucine metabolite with anti-catabolic signalling — and this delivers a real 1.5 g dose of it.
Against it HMB's human trial record is inconsistent and far weaker than creatine's, and most of the positive work is in untrained or elderly populations. You are paying a premium for the least certain ingredient in the tub.
5. Essential Grass-Fed Whey Protein
Impeccable sourcing and NSF Certified for Sport, which no other protein here matches.
Against it Twice the price of Optimum Nutrition for four grams less protein per serving. The certification is worth real money only if you are actually tested.
Prices checked September 2026 and change often. No link on this page is an affiliate link, and no brand listed has paid for, reviewed, or been shown this ranking before publication.
Why creatine and not the more exciting options
Creatine works by a mechanism that is genuinely boring. It increases phosphocreatine stores, which improves the capacity to do repeated high-intensity work, which means you can train at an intensity that tells your body the muscle is still needed.
It does not preserve muscle directly. It preserves your ability to do the thing that preserves muscle.
The protein problem, which is really a logistics problem
A 90 kg person needs roughly 110 to 145 g of protein a day. On a therapeutic dose of tirzepatide, four bites into a chicken breast, that target can feel like a practical joke.
This is why whey ranks second on a page nominally about supplements. It is not pharmacologically interesting. It is a way to get 24 g of protein into a body that has stopped cooperating with cutlery, and I have written at length about the logistics of hitting protein when nothing appeals.
Nobody has ever lost muscle because they skipped a supplement. People lose it constantly because they skipped the protein and the training that the supplement was supposed to support.
What I would skip
HMB, unless you are already covering the basics and enjoy the theory. Branched-chain amino acids, which are strictly worse than whole protein. Anything described as a natural anabolic. Testosterone boosters, categorically.
The market for muscle preservation on GLP-1s is going to get very crowded over the next two years, and almost all of the new entrants will be selling variations on ingredients that did not work the last time they were fashionable.