Creatine myths on a GLP-1: bloating, kidneys and hair, checked against the sources

By Aali Qureshi, founder of Deadly Company · Published October 24, 2026 · Updated October 31, 2026

Short answer: The three creatine fears: bloating, kidney damage, hair loss, do not survive their sources. Creatine draws water into muscle cells, not under the skin or into the stomach. In healthy adults, the ISSN position stand finds no demonstrated kidney harm at recommended doses. The hair claim rests on one unreplicated 2009 study measuring a hormone marker, not hair. Muscle Water Aminos carries 3.5g of creatine, inside the 3–5g research range.

The claim	The source	What it actually found
“Creatine bloats you”	Creatine’s known storage physiology	Water is drawn into muscle cells (intracellular) — not under the skin, and nothing to do with the stomach
“Creatine damages your kidneys”	ISSN position stand on creatine (Kreider et al., 2017)	No demonstrated kidney harm at recommended doses in healthy adults; the scare runs on creatinine, a marker creatine nudges, being misread as damage
“Creatine causes hair loss”	van der Merwe et al. (2009), college rugby players	A DHT-related marker rose over three weeks. No hair was measured. Never replicated; no study has shown creatine causing hair loss

Three rumours, repeated until they sound like findings

There’s a particular frustration that belongs to this medication. You’re doing the disciplined thing — losing weight on purpose, trying to keep the muscle while the fat goes — and every attempt to protect that muscle arrives with a warning label written by the internet. Creatine is the worst case: the most-studied supplement in sports science, cheap, boring, and carrying three scary stories repeated so often, in so many confident voices, that they now circulate as if they were results.

GLP-1 life gives each rumour a place to land. Your stomach already feels unpredictable, so “creatine bloats you” sounds plausible before it’s examined. You get bloodwork more often, so a moving kidney number sounds ominous before anyone explains which number it is. And shedding during rapid weight loss is real and distressing, so “creatine causes hair loss” lands on frightened ground. The myths are aggressive because the audience is primed. This article’s job is narrower and ruder: take each claim back to the source it cites, and read the source out loud.

Myth 1: “Creatine bloats you”

What the claim pictures. A puffy face. Water sloshing under the skin. A stomach that looks six months along by dinner. One word — bloating — doing duty for three completely different kinds of water.

What creatine actually does with water. Creatine is stored inside muscle cells, and water follows it there. The technical word is intracellular: the water is drawn into the muscle cell itself, which is where you want it — a hydrated muscle cell is a functioning one, and this is part of how the ingredient supports training. It is not water pooling under the skin, and it has nothing to do with your stomach. Your stomach does not know your creatine arrived. The scale may tick up slightly in the first weeks as stores fill — on a weight-loss medication that can look like a stall, and it’s worth knowing in advance that early creatine weight is water inside muscle, while fat loss continues underneath it.

Where the stomach stories actually come from. Read the anecdotes closely and two patterns keep showing up. The first is dose delivery: large amounts of dry powder in one go — the loading phase, roughly four times a maintenance dose for about a week, is the era most cramping and digestive complaints come from. Nobody needs to load; at 3–5g a day, stores reach the same saturation over a few weeks, with none of the ceremony. The second pattern is the company creatine keeps: it’s very often taken inside a thick intact-protein shake. On a GLP-1, gastric emptying is slowed by design, and a heavy shake sitting in a slowed stomach is a genuinely miserable experience that has nothing to do with the 3–5g of powder dissolved inside it. The shake gets forgiven because it calls itself food; the creatine gets blamed because it has a scary name. If something is bloating you, the honest order of suspects starts there.

Myth 2: “Creatine damages your kidneys”

What the source concludes. The ISSN position stand on creatine (2017) — the field’s consensus review of the safety literature — concludes that creatine supplementation at recommended doses has not been shown to harm the kidneys in healthy adults. That is the finding, at the strength the evidence supports: healthy adults, recommended doses, no demonstrated harm. Creatine has one of the longest safety track records of any supplement in the literature, which is why it’s the boring answer in every evidence review and the exciting villain in every comment thread.

Where the scare comes from: a marker mistaken for damage. Creatine and creatinine are one letter apart and entirely different things, and the confusion between them does real work in this myth. Creatinine is a breakdown product your muscles produce at a steady rate; clinicians use blood creatinine as an indirect marker of how well the kidneys are filtering. Taking creatine can nudge that marker up slightly — more creatine in the system, slightly more of its breakdown product in the blood — without the kidneys themselves being damaged at all. A marker moving is information about the marker, not a photograph of an injured organ. But put a slightly raised creatinine line in front of someone who has just started a supplement with a similar name, and the myth writes itself.

The practical version, if you’re on a GLP-1 and getting regular labs: tell your clinician what you take, including creatine, so the marker is read in context instead of in alarm. The boundary, plainly: none of the above is a sentence about your kidneys. The conclusion is about healthy adults. If you have kidney disease, a renal history, or any condition your clinician monitors through those markers, the rule is not negotiable in a supplement article: clear creatine — clear every supplement — with your clinician before you start. The evidence gives healthy readers a green light; it gives nobody a reason to route around their own doctor.

Myth 3: “Creatine causes hair loss”

The entire evidence base, in one paragraph. In 2009, van der Merwe and colleagues published a small study in college rugby players. Over a three-week period involving creatine supplementation, a marker related to dihydrotestosterone (DHT) — a hormone associated with hair loss in people genetically sensitive to it — rose in the creatine group. That is the study. Not a hair study: no hair was counted, no hair loss was measured, no participant was followed for shedding. A hormone marker moved, in a small group of young male athletes, over three weeks.

What has happened since: nothing. The finding has never been replicated, and no study has shown creatine causing hair loss. Read the myth’s citations all the way down — the articles, the videos, the forum threads — and every road ends at the same single 2009 marker study, photocopied by repetition into something that looks like a literature. It is one study. It measured a marker, not hair. This article won’t dress that up in either direction: the claim isn’t disproven by a mountain of hair research, it is unsupported by anything beyond one small, old, unreplicated marker finding.

Why this one lands so hard on a GLP-1. Because the shedding is real — it just has a different author. Rapid weight loss itself, and the reduced intake that comes with a suppressed appetite, are well-recognised triggers for a wave of shedding a few months in; hair shedding on a GLP-1 is this Journal’s account of that mechanism. Someone three months into treatment, eating far less, watching hair come out in the shower, starts creatine in the same season — and the supplement standing nearest the scene gets arrested for it. If you are shedding, that deserves a real conversation with your clinician about intake, rate of loss, and the usual workup — not a verdict borrowed from a 2009 rugby study that never looked at anyone’s hair.

The GLP-1 point: creatine only works if it happens every day

Strip the myths away and the actual creatine problem on this medication is not safety. It is arithmetic and memory.

Creatine doesn’t work acutely — there’s no dose you take once, before a workout, that does anything. It works by saturation: daily intake builds muscle stores over weeks, and the benefits ride on those stores staying topped up. Miss days and the mechanism quietly unwinds. Which makes creatine’s real-world enemy not your kidneys or your hairline but your routine — and a GLP-1 routine is the most fragile routine in supplementation. A separate chalky scoop with its own tub and its own little ceremony is exactly the kind of standalone ritual that gets skipped on a nauseous Tuesday and never quite resumes. Everyone forgets their creatine. It is the best-evidenced ingredient in the cabinet and the one most likely to be found, a year later, as a fossil in the cupboard. (Creatine on a GLP-1: dose and timing is the companion piece on the saturation schedule itself.)

So the design decision is not really about creatine. It’s about where a daily, saturation-dependent ingredient has to live to survive a suppressed appetite: inside a habit that already happens. That’s the thinking behind creatine in every scoop: Muscle Water Aminos prints 3.5g of creatine on its label — inside the 3–5g research range — in the same serving as its aminos. Translated into food: 3.5g of creatine is roughly the creatine in ~2 lb of raw beef. Nobody on this medication is eating ~2 lb of raw beef a day; that is the appetite arithmetic the medication imposes, and it is the entire reason the creatine is in the glass instead of in a steak or a second tub.

The aminos are there for the other half of the same problem, and the mechanism matters here too, in two sentences. Leucine is the ignition. The other EAAs are the bricks. Leucine switches on muscle protein synthesis at a trigger of roughly 2.5–3g per feeding — about the leucine in ~5 eggs eaten at once — and the nine essential amino acids supply the material the switch builds with; training makes the muscle responsive to both. The 4g of leucine in Muscle Water Aminos is formulated to clear the leucine trigger with a 1.3g margin, alongside 16g of EAAs — the whole ~138g steak’s worth of building blocks — and the creatine that supports the training half of the work. The claim, in the wording we hold ourselves to: the serving helps preserve lean muscle when paired with resistance training and adequate protein. Not instead of training. Not instead of protein. Paired with both.

And the boundary, printed in every article in this Journal: Muscle Water Aminos is a protein supplement, not a meal replacement. Food first — this covers the protein on the days food isn’t happening.

What to actually do with all this

First, retire the three fears at their actual sizes: intracellular water is not bloat; a nudged marker in a healthy adult is not kidney damage, per the consensus stand; one unreplicated 2009 marker study is not a hair-loss finding. Second, take creatine the boring way — 3–5g a day, dissolved in a drink, no loading phase, no timing ritual, daily. Third, protect the habit, not the intention: attach the dose to something you already do every day, because saturation is built by Tuesdays, not by enthusiasm. Fourth, route the real exceptions like an adult: existing kidney disease, a renal history, or a clinician already watching your markers means the supplement conversation happens with that clinician first — and unexplained shedding deserves the same route, because on a GLP-1 it usually has an explanation worth finding. The myths asked you to be afraid of the ingredient. The sources ask you to be consistent with it. Only one of those requests is backed by anything.

Questions people actually ask

Will creatine make the scale go up on my GLP-1? It can tick up slightly in the first weeks: water drawn into muscle cells as stores saturate. It is not fat, and it is not the medication failing — fat loss continues underneath it.

Do I need a loading phase? No. Loading — roughly four times a maintenance dose for about a week — saturates stores faster, and it is also where most digestive-complaint stories live. At 3–5g a day you reach the same saturation over a few weeks. On a slowed, sensitive GLP-1 stomach, the slow road is the sensible route.

My bloodwork showed creatinine up a little. Should I panic? No — and don’t self-diagnose in the other direction either. Creatine can raise the creatinine marker slightly without kidney damage, which is why the marker has to be read in context. Tell your clinician you take creatine, show them the dose, and let them interpret the trend. With any kidney history at all, that conversation should have happened before the first scoop.

Is there any study showing creatine causes hair loss? No. There is one small 2009 study (van der Merwe et al.) in college rugby players where a DHT-related marker rose over three weeks. It has never been replicated, it did not measure hair, and no study has shown creatine causing hair loss. If you are shedding on a GLP-1, rapid weight loss and reduced intake are the recognised suspects to raise with your clinician.

Why is the creatine inside an amino drink instead of its own tub? Because saturation is an adherence problem before it is a chemistry problem. A standalone tub is a standalone habit, and standalone habits are what a suppressed appetite quietly deletes. Inside the serving — 3.5g, printed, inside the 3–5g research range — the dose rides a habit that already happens daily.

Does creatine do anything if I don’t train? Very little for muscle, and we won’t pretend otherwise. Creatine supports the training that signals muscle to stay, and the aminos in the same serving answer to exercise too. The product half of this protocol has always been the smaller half. Train, eat what you can, and let the glass cover the gap.

Where this leaves you

Bloating: creatine’s water goes inside muscle cells; the stomach bloat people fear on a GLP-1 belongs far more often to heavy intact-protein servings sitting in a slowed stomach, and to the loading-era habit of swallowing large dry doses. Kidneys: in healthy adults at recommended doses, the ISSN position stand finds no demonstrated kidney harm — the scare runs on creatinine, a marker creatine raises slightly, being misread as damage; anyone with existing kidney disease clears supplements with their clinician, full stop. Hair: the whole claim is one small 2009 study, a DHT marker, college rugby players, three weeks, never replicated. What remains is the unglamorous truth: creatine on a GLP-1 works by daily saturation, everyone forgets a standalone habit, and 3.5g printed inside a serving you already take is what a saturation ingredient has to look like on a suppressed appetite.

Deadly Company is the 1° Deadlier lifestyle company — apparel, the GEAR supplement system, this Journal, and Body English — and it publishes myth-checks like this one because a company that sells a creatine-containing product should be the first to show its working on creatine. The protocol these myths orbit is the GLP-1 muscle-preservation protocol; What is Deadly Company? is where the company behind the Journal explains itself. More power to you.

Sources: International Society of Sports Nutrition position stand on creatine supplementation (Kreider et al., 2017): creatine monohydrate as the studied form; 3–5g/day maintains saturated muscle stores; safety conclusion — no demonstrated kidney harm at recommended doses in healthy adults; loading optional, saturating stores faster than maintenance dosing alone. van der Merwe et al., Clinical Journal of Sport Medicine (2009): single small study in college rugby players (n=20, crossover); DHT-related marker rose over three weeks of creatine supplementation; never replicated (per the ISSN misconceptions review), and no study showing creatine causing hair loss was identified in the literature this Journal reviewed (search date October 2026). 2025 joint advisory on nutritional priorities during GLP-1 therapy (ACLM/ASN/OMA/TOS): protein target 1.2–1.6 g/kg adjusted body weight/day; slowed gastric emptying as a recognised feature of GLP-1 therapy. Deadly Company drinkability doctrine file, 2026. Translation Bank, verified 2026-10-21 (3.5g creatine ≈ the creatine in ~2 lb of raw beef; leucine trigger ~2.5–3g ≈ the leucine in ~5 eggs eaten at once; 16g EAAs ≈ the whole ~138g steak).

This article is education, not medical advice. It does not diagnose or treat any condition. Talk to your clinician about your medication, your supplements, and any kidney history before changing your intake. These statements have not been evaluated by the FDA.