Creatine HCl vs Monohydrate: Which Is Better?

By Alex Lawrence, qualified nutritionist · Fact-checked against sources on 30 October 2026 · Updated 30 October 2026

For most people, creatine monohydrate is the better buy. Creatine HCl dissolves in water far more easily, but the trials comparing them head to head found it works no better for strength or muscle, and it usually costs more per gram.

Both are creatine, and in trials both improved strength and muscle compared with a placebo. The difference is in the evidence behind them and the price. For what creatine does in the first place, see what does creatine do?

What’s the difference between creatine HCl and monohydrate?

The difference is what the creatine molecule is bound to. Creatine monohydrate is creatine with one water molecule attached. Creatine HCl (hydrochloride) is creatine bound to hydrochloric acid, which makes it a salt.

That change mainly affects how well it dissolves. In a 2010 lab study, creatine HCl was 38 times more soluble in water than monohydrate. The same study tested how well different forms crossed a layer of human gut-like cells in the lab, and found no significant difference between HCl and monohydrate.

	Creatine monohydrate	Creatine HCl
Research behind it	The most studied form by far	A handful of small trials
Dissolves in water	Less easily	Easily (38× more soluble)
Shown to raise muscle creatine	Yes	No better than monohydrate in trials
Dose used in trials	3–5 g a day	5 g a day in the 2025 trial
Price	Usually cheapest	Usually more per gram

Does creatine HCl work better than monohydrate?

No: in the trials that compared them directly, HCl worked about the same as monohydrate. Two recent randomised trials are the best evidence.

2025, elite athletes. Londoño-Velásquez and colleagues gave 31 male and female handball and softball players 5 g a day of monohydrate, HCl or a placebo for 8 weeks. There were no significant differences between the groups. Both forms improved jump performance and fat-free mass to a similar degree, and only the monohydrate group increased fat-free mass index. The authors called claims that HCl is superior “unfounded and misleading”.
2024, young adults lifting weights. Eghbali and colleagues split 40 people aged 18–25 into four groups for 8 weeks of resistance training: HCl, monohydrate with loading, monohydrate without loading, or placebo. Both forms improved strength, muscle size and hormone markers compared with placebo, and HCl showed no benefit over monohydrate.

Both trials are small (about 10 people per group) and short (8 weeks), so they can’t rule out tiny differences. But they don’t support paying more for HCl.

Does better solubility mean better absorption?

Not necessarily. Dissolving more easily in a glass of water doesn’t mean more creatine reaches your muscles. The 2021 ISSN review says solubility has no influence on tissue uptake, and that no peer-reviewed papers show equal amounts of creatine salts raising muscle creatine more than monohydrate does.

Monohydrate is already absorbed very well. A review of newer creatine forms notes that monohydrate isn’t broken down during normal digestion and that nearly 99% of what you swallow is either taken up by muscle or passed out in urine. It also found little to no evidence that any newer form is more effective or safer than monohydrate.

Can you take a smaller dose of creatine HCl?

There’s no good evidence that a smaller dose of HCl does the same job as 3–5 g of monohydrate. You may see HCl products suggest a lower dose, on the basis that better solubility means you need less. Since solubility hasn’t been shown to change how much creatine your muscles take up (see above), a smaller dose may simply give you less creatine.

The 2025 trial used 5 g a day of each form, and they performed about the same. If you choose HCl, there’s no evidence-based reason to take less than the standard dose. The creatine calculator gives you a daily dose and an optional loading plan by body weight.

Is creatine HCl easier on your stomach?

It might feel that way to some people, but this hasn’t been shown in trials. HCl is marketed as causing less bloating and stomach upset because it dissolves better. The head-to-head trials above weren’t designed to test that.

Stomach upset with monohydrate mostly happens with large single doses, such as during a loading phase. The ISSN position stand reports that weight gain is the only consistently reported side effect of creatine. If monohydrate does upset you, try:

Skipping the loading phase and taking 3–5 g a day from the start.
Splitting your dose into two smaller servings.
Taking it with a meal or mixing it into a shake.

On water weight, see does creatine make you gain weight?. HCl isn’t shown to change it.

Which is cheaper?

Monohydrate is usually much cheaper. A 2022 analysis of 175 creatine products on Amazon.com found products with only monohydrate averaged about $0.12 a gram, against about $0.26 a gram for products using only other forms. Those are US prices from 2022, so check current UK prices yourself, but the gap is typical. The same analysis rated around 88% of alternative creatine products as having limited or no evidence for their bioavailability, efficacy and safety.

What about other types of creatine?

Other forms have even less evidence behind them than HCl. Shops sell creatine ethyl ester, buffered creatine, creatine nitrate, creatine citrate and blends of several forms. The 2021 ISSN review looked at these and concluded that monohydrate remains the optimal choice, and a review of newer forms found little to no evidence that any of them beat monohydrate.

The 2022 Amazon analysis found 16 forms of creatine other than monohydrate on sale, and only 8% of all the products it looked at were third-party certified. Whatever form you buy, a third-party testing mark on the label is a sensible extra check on what’s in the tub.

Which should you buy?

Buy creatine monohydrate unless you have a specific reason not to. The ISSN calls monohydrate the most effective nutritional supplement currently available for high-intensity exercise capacity and lean mass, and the 2021 review calls it the optimal choice.

Pick HCl only if you genuinely prefer it, for example because it dissolves cleanly in a small drink, and you’re happy to pay more. Take a full dose and don’t expect extra results.

Whichever you pick, what matters most is taking it every day. Get Gains has supplement tracking with reminders on its free tier, so you can log each dose and keep your streak going.

Speak to a GP or pharmacist before taking creatine if you’re pregnant, breastfeeding, under 18, have kidney disease or take medication. This page is general information, not medical advice (see our terms).

Does creatine cause hair loss? Current evidence says no. See does creatine cause hair loss?
How much creatine should I take? 3–5 g a day for most people. Use the creatine calculator.

How we wrote this: drafted with AI assistance, then fact-checked against the sources below and edited by Alex Lawrence. Read our editorial policy.

Sources

creatine calculator