The rundown

  • Creatine cannot walk into a muscle cell. It is dragged in by a transporter whose full formal name is the sodium and chloride dependent creatine transporter.
  • What you take creatine with has been shown to change how much of it ends up stored in muscle. In one biopsy study the gap was about 60 percent.
  • Creatine also raises how much water your body needs, measured in litres, which makes hydration part of the dose rather than an afterthought.
  • What you lose in training is saline, not water. Replacing it with plain water replaces the wrong thing.
  • Five practical rules follow from that, and they cost nothing. We have also priced up the do it yourself version, and named the product we ended up recommending. That brand paid for this article. The evidence below is the same either way, and you can check every citation.

Nobody quits creatine because it stopped working. They quit because they were never sure it started.

You have probably felt some version of it. Three months in, five grams every morning, stirred into a glass of water and choked down before coffee, and no clear sense that anything is different. So the tub drifts to the back of the cupboard behind the protein, and somewhere around month five you stop replacing it.

The standard explanation is that you are a non responder, and it is a real category. When researchers grouped people by how much creatine had actually accumulated in their muscle, the spread between the top and bottom groups was wide enough to be a different experience of the same supplement.[5] Some people load up. Some barely move.

What almost never gets asked is why. The dose was identical. The molecule was identical. So the variable was never the powder.

The five grams was never the hard part. Everybody gets the five grams right. Almost nobody thinks about the glass it arrives in.

Creatine has had a very strange three years

For most of its commercial life creatine was a bodybuilding product with a bad reputation and an unusually good evidence base. That changed fast. The International Society of Sports Nutrition position stand now catalogues clinical applications well outside sport, and reviews sustained daily use at doses far above five grams without finding adverse effects in healthy or clinical populations.[1] The live research has moved toward cognition, recovery and healthy ageing. It is no longer a meathead supplement. It is the thing your doctor might bring up.

All of which has produced an enormous amount of writing about creatine, nearly all of it answering the same two questions: how much, and is it safe. Five grams, and yes. Both are settled, and because they are settled, almost nobody asks the third one, which is the only one with any room left in it. Once you have swallowed it, what actually decides how much gets in?

How creatine actually gets into a muscle cell

There are three parts to this, and none of them are controversial. They have been sitting in the literature for thirty years. They are simply boring enough that they never made it onto the front of the tub.

Part one: the door runs on sodium and chloride

Creatine is a polar molecule. It cannot drift across the fatty membrane of a muscle cell the way alcohol or oxygen can. It needs a dedicated transporter protein, and that protein is called SLC6A8.[2] Look it up in any review paper and you will find its full formal name, which is the single most useful fact in this article:

The sodium and chloride dependent creatine transporter.

Sodium and chloride are not a footnote in that name. They are the power supply. SLC6A8 is a symporter, meaning it has no energy source of its own, so it borrows one: it uses the sodium gradient your cells maintain across their membranes to haul creatine inwards against creatine's own concentration gradient. Every trip carries roughly two sodium ions and one chloride ion along with each creatine molecule.[2]

Creatine does not walk into a muscle cell. It gets carried. And the thing that carries it runs on sodium.

Figure 1  /  How creatine actually enters a muscle cell

OUTSIDE THE MUSCLE CELL INSIDE THE MUSCLE CELL Na Na Cl Cr SLC6A8 creatine transporter Cr No sodium gradient, no transport. The door has no power supply of its own.

SLC6A8 couples creatine transport to the movement of sodium and chloride down their own gradients. This is why what you take creatine with has been shown to measurably change how much of it ends up stored in muscle.[2][3]

The proof: same dose, same molecule, 60 percent apart

This is not a theoretical point. It has been tested directly, in the least ambiguous way available. In 1996, a group at Nottingham gave subjects creatine either alone or alongside a co ingested vehicle, then cut small samples out of their thigh muscle to see how much had actually arrived. The co ingestion group had accumulated roughly 60% more creatine in muscle.[3] The researchers attributed it to an insulin mediated augmentation of sodium dependent creatine transport, which is to say that the effect ran through the sodium pump.

Same dose. Same molecule. Same four weeks. A 60 percent gap in what ended up in the muscle, decided entirely by what it was swallowed with.

An honest caveat, because we would rather you trusted the rest of this page. That study drove the effect with a large dose of carbohydrate to spike insulin, and nobody sensible is going to tell you to take your creatine with a sugary drink every morning for the next decade. A follow up found protein could do a similar job with far less sugar.[4] What the 1996 result establishes beyond argument is narrower than the headline, and more useful than it: the vehicle is a variable, and plain water is the one vehicle that contributes nothing at all.

Part two: creatine raises how much water you need

Creatine is osmotically active. Once inside a muscle cell it draws water in behind it, which is a substantial part of why creatine works at all. That intracellular water is not cosmetic puffiness, it is cell volumisation.

2.3 L
Measured increase in total body water Seven days of creatine supplementation increased total body water by 2.3 litres in a group of soccer players, measured by deuterium oxide dilution.[7] A separate trial found total body water rose without distorting the balance between intracellular and extracellular compartments.[6]

So taking creatine daily raises your fluid requirement. That is a feature rather than a problem, but it does mean the hydration side stops being optional.

Part three: what you sweat out is saline, not water

The fluid you lose training is not plain water. Across athletes, sweat sodium runs from roughly 17 to 106 mmol per litre, which is somewhere between a quarter of a gram and two full grams of sodium per litre of sweat.[9] Meanwhile mild dehydration of about 2% of body mass measurably reduces strength, power and high intensity endurance.[10]

Put the three parts together and the standard routine starts to look strange. You take a compound that depends on sodium to be absorbed and that raises your fluid demand. You then lose sodium rich sweat training. And you replace all of it with plain water.

Five things to keep in mind, if you want your creatine to land

Nothing above this point is about a brand. It is about a molecule and the protein that carries it. Five practical rules fall out of it, and four of them are free.

  • Get the five grams right, then stop optimising the powder

    Monohydrate, full dose, every day including rest days. This part is genuinely solved and there is no clever form that beats it. Micronised, hydrochloride, buffered, liquid: monohydrate is the form carrying essentially all of the research, and it is the cheapest one.[1] If you are still shopping for a better powder, you are optimising the only variable that was never the problem.

  • Stop taking it with plain water

    This is the rule that costs nothing and the one almost everyone gets wrong. The transporter is sodium and chloride dependent. Plain water supplies neither. It is not that water is harmful, it is that water is the one vehicle that contributes literally nothing to the mechanism doing the work.

  • Check that the electrolytes include chloride, not just sodium

    Read the transporter's name one more time. Both ions are in it. Most hydration products are engineered around sodium and potassium and treat chloride as whatever happens to tag along with the salt. Chloride is named in the protein for a reason, and it is the number worth turning the sachet over to find.

  • Raise your fluid intake, and make sure it stays in

    Creatine increases total body water by litres, not millilitres. That raises your fluid requirement as a direct consequence of taking it. Fluid without electrolytes largely passes through, which is why drinking more plain water often changes surprisingly little.

  • Do not quit in week three

    Without a loading phase, muscle saturation takes roughly three to four weeks.[1] A large share of the people who conclude that creatine did nothing for them quit inside the window in which it was still filling. Adherence is not a soft factor to wave at. It is the variable that decides the outcome.

Rules one through four are chemistry. Rule five is a human being remembering to do a slightly annoying thing every morning for a year, and rule five is the one that actually breaks.

So can you just do this yourself?

Yes. Genuinely, yes, and it is cheaper. We are not going to pretend otherwise on a page you can fact check in about ninety seconds. Here is the honest costing.

  • Bulk creatine monohydrate, 500 g tub, 100 servingsabout 20 to 25c a day
  • A decent electrolyte stick with a real sodium doseabout $1.00 to $1.50
  • Do it yourself, per dayroughly $1.25 to $1.75

That works. If you will actually do it, do it, and you can close this page without buying anything. Three things worth knowing before you build the stack yourself. Turn the sachet over and find the chloride, because most are designed for hydration alone, where it is an afterthought. Watch the sugar, which a large share of the category is built on, fine for a race and less fine as a daily habit for ten years. And salting your own creatine works chemically and tastes like seawater, which drops you straight back onto rule five.

Which is the real cost of the DIY version, and it is not the money. It is two tubs, two scoops, two subscriptions, and one of them running out before the other. Every extra step is another chance for the habit to quietly stop in week nine for no particular reason.

Where the sponsorship starts

What we ended up recommending

Everything above this line was true before anyone paid us. Below it we are telling you what we recommend, and we are being paid by the company we are about to name. That is the deal, and it is why we handed you the mechanism and the free version first. You can judge what follows on the panel rather than on our adjectives.

The product is Harlo. One drink, a full clinical dose of creatine and a functional electrolyte load in the same glass, which collapses all five rules into a single thing you do once a day. Several brands are now bolting creatine onto an electrolyte mix. The reason we picked this one is sitting in the third line of the panel.

What is actually in one serving
  • 5,000 mgCreatine monohydrate. The full clinical dose, in the form that carries essentially all of the research.[1] Rule one, handled.
  • 1,180 mgTotal electrolytes. A functional load rather than a flavouring pinch. Rules two and four.
  • 630 mgChloride. This is the number that decided it for us. It is the larger of the two ions in the transporter's name, and it is the one the hydration category routinely leaves as an afterthought. Rule three.
  • 290 mgSodium, plus 200 mg potassium and 60 mg magnesium. The sodium sits at the lighter end of what a litre of sweat costs you.[9]
  • 0 gSugar. Which matters most once something is a daily habit rather than a race day drink.
  • CertifiedNSF Certified for Sport. Independently batch tested for banned substances and label accuracy.
  • FormatLight lemon, clean salty finish. 30 servings, vegan, gluten free, mixes cold in ten seconds. Rule five, which is the one that actually breaks.

To be clear about what we are and are not claiming: Harlo does not market itself as a chloride product, and we are not telling you they formulated around SLC6A8. We went looking for a panel that satisfied all five rules at once, and this is the one we found. The panel is the panel whatever the intent behind it was.

Five rules, one glass, once a day

The version you will still be doing in week nine.

5,000 mg of creatine monohydrate with 1,180 mg of electrolytes, including 630 mg of chloride. Zero sugar. NSF Certified for Sport. Backed by a 30 day money back guarantee.

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Free returns within 30 days

The three honest options, side by side

Including the middle column, because it is the one most readers should genuinely consider and leaving it out would be the tell that this page was an advertisement pretending otherwise.

  Creatine in plain water Do it yourself stack Harlo
Creatine dose 5 g monohydrate 5 g monohydrate 5 g monohydrate
Rule 2 · sodium present No Yes 290 mg
Rule 3 · chloride present No Usually unstated 630 mg
Rule 4 · replaces sweat losses No Yes Yes
Rule 5 · number of daily habits One Two One
Sugar None Varies, often high None
Third party batch tested Varies wildly by brand Varies wildly by brand NSF Certified for Sport
Roughly what it costs a day 20 to 25c $1.25 to $1.75 One subscription
Something you look forward to Chalky water Two things to mix Light lemon, salty finish

To be fair to the first column, it is cheap, it is the same molecule, and it works. And the middle column is a completely legitimate answer if you are the kind of person who will keep doing it. The argument for the third is narrow: four of the five rules are chemistry you can solve for a dollar, and the fifth is not a chemistry problem at all. Rule five is solved by making the thing pleasant enough that you are still doing it in week nine, which is precisely the week nobody plans for.

A person training in a dimly lit gym with warm backlight, mid session
The difference tends to show up in the fourth set rather than the first, and in the weeks rather than the days.

What to expect, realistically

We are not going to promise you a transformation in a week, because that is not how creatine works and you would notice we were lying. This timeline applies to any of the three columns above, not just the one with a sponsor attached.

  • Days 1 to 7 Mostly the hydration side. If you train regularly and have been drinking plain water, this is where the electrolytes are doing most of the visible work. Better fluid retention, less of the flat feeling late in a session.
  • Weeks 2 to 4 Muscle creatine stores fill. At 3 to 5 g daily, without a loading phase, saturation takes roughly three to four weeks.[1] This is where the strength and repeat effort side starts showing up, usually in your later sets rather than your first.
  • Week 4 onward Steady state. Full stores maintained by the daily dose. This is the point at which most people stop thinking of it as a supplement and start thinking of it as part of the morning.

Four weeks is the honest timeline

The 30 day guarantee covers exactly that window.

Which is convenient, because four weeks is roughly how long it takes to know whether this is working for you. If it is not, you send it back.

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Trusted by 300,000+ athletes

The questions people actually ask

You just told me I could do this myself for about a dollar. So why recommend a paid product?

Because the dollar was never what stopped anyone. Four of the five rules are chemistry, and chemistry is cheap to solve once you know the answer, which is why we gave the answer away above rather than hiding it behind the recommendation. Rule five is not a knowledge problem. It is the fact that two tubs is two habits, and one of them will quietly stop. If you are confident that will not be you, build the stack yourself, and this page has still done its job.

Why does the chloride number matter so much to you?

Because it is half of the transporter's formal name and roughly nobody in the hydration category treats it as a spec worth printing. Most electrolyte products are designed to replace sweat, where sodium is the headline and chloride is whatever comes attached to it. Once you are using the drink to also feed a sodium and chloride dependent transporter, the second ion stops being incidental. It is the one number that separated the products we looked at.

Do I need to do a loading phase?

No. Loading with around 20 g a day for five to seven days fills stores faster, but 3 to 5 g daily reaches the same saturation in about three to four weeks. The endpoint is identical. Loading only changes how quickly you get there.[1]

Will the extra sodium make me retain water or look puffy?

The water creatine draws in goes primarily into the muscle cell rather than under the skin. Measured properly, total body water rises without the intracellular and extracellular balance being distorted.[6] As for the sodium itself, the figure is 290 mg, not the 1,180 mg total that covers all four electrolytes. That is at the low end of what you lose in a single litre of sweat, which across athletes runs from roughly a quarter of a gram to two full grams.[9] It is partial replacement, not surplus.

Is taking creatine every day safe?

The International Society of Sports Nutrition position stand reviewed doses up to 30 g per day sustained for five years and found no adverse effects in healthy or clinical populations.[1] Five grams sits a long way inside that. The usual caveats apply if you have kidney disease or are pregnant, in which case ask your doctor rather than a website.

Does the research all point one way?

Not entirely, and we would rather say so. A 2025 analysis of NHANES data covering nearly one hundred thousand people found higher dietary creatine intake associated with lower total body water, which complicates the simple story that creatine hydrates you.[11] Separately, a meta analysis of ten trials found no evidence that creatine harms heat tolerance or fluid balance, putting an old worry to rest.[8] Neither finding touches the transporter mechanism, which is the part this product is built on.

I do not train seriously. Is this for me?

Some of the most active current creatine research concerns cognition, recovery and healthy ageing rather than sport, and the position stand catalogues clinical applications well outside the gym.[1] The daily dose matters more than the training does.

The bottom line

The most useful thing on this page is free, so take it with you whatever you decide to buy. Creatine cannot get into a muscle cell on its own. It is carried by a protein whose name contains the words sodium and chloride. What you take your five grams with is not a neutral detail, and plain water is the worst answer available to you. That was true in 1996, it is true tomorrow, and nobody had to pay us for it.

What we were paid for is the recommendation, and it is narrow. Harlo did not invent a molecule and does not claim to. It took two things that were always physiologically linked, that the industry insisted on selling in separate tubs, and put them in one scoop at doses that do something, chloride included.

You could assemble something close for about a dollar a day. Some of you should, and we would rather say so than pretend the option does not exist. The rest of you already know how that ends: week nine, two tubs, one scoop, and a habit that quietly stopped.

References

  1. Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition. 2017;14:18. link.springer.com/article/10.1186/s12970-017-0173-z
  2. Farr CV, El-Kasaby A, Freissmuth M, Sucic S. Structural correlates of the creatine transporter function regulation. Amino Acids. 2016;48(8):1897-1911. pubmed.ncbi.nlm.nih.gov/26951207
  3. Green AL, Hultman E, Macdonald IA, Sewell DA, Greenhaff PL. Carbohydrate ingestion augments skeletal muscle creatine accumulation during creatine supplementation in humans. American Journal of Physiology. 1996;271(5):E821-E826. pubmed.ncbi.nlm.nih.gov/8944667
  4. Steenge GR, Simpson EJ, Greenhaff PL. Protein and carbohydrate induced augmentation of whole body creatine retention in humans. Journal of Applied Physiology. 2000;89(3):1165-1171. pubmed.ncbi.nlm.nih.gov/10956365
  5. Syrotuik DG, Bell GJ. Acute creatine monohydrate supplementation: a descriptive physiological profile of responders vs. nonresponders. Journal of Strength and Conditioning Research. 2004;18(3):610-617. pubmed.ncbi.nlm.nih.gov/15320650
  6. Powers ME, Arnold BL, Weltman AL, et al. Creatine supplementation increases total body water without altering fluid distribution. Journal of Athletic Training. 2003;38(1):44-50. pmc.ncbi.nlm.nih.gov/articles/PMC155510
  7. Creatine supplementation increases total body water in soccer players: a deuterium oxide dilution study. International Journal of Sports Medicine. 2016;37(2):149-153. pubmed.ncbi.nlm.nih.gov/26509366
  8. Lopez RM, Casa DJ, McDermott BP, Ganio MS, Armstrong LE, Maresh CM. Does creatine supplementation hinder exercise heat tolerance or hydration status? A systematic review with meta-analyses. Journal of Athletic Training. 2009;44(2):215-223. pmc.ncbi.nlm.nih.gov/articles/PMC2657025
  9. Baker LB, Barnes KA, Anderson ML, Passe DH, Stofan JR. Normative data for sweating rate, sweat sodium concentration and sweat sodium loss in athletes: an update and analysis by sport. Journal of Sports Sciences. 2019;37(20):2356-2366. pubmed.ncbi.nlm.nih.gov/31230518
  10. Judelson DA, Maresh CM, Anderson JM, et al. Hydration and muscular performance: does fluid balance affect strength, power and high intensity endurance? Sports Medicine. 2007;37(10):907-921. pubmed.ncbi.nlm.nih.gov/17887814
  11. Dietary creatine and hydration biomarkers in the general population: NHANES 1999-2023. Food Science and Nutrition. 2025. pmc.ncbi.nlm.nih.gov/articles/PMC12203408