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Health & Ingredients

Creatine Monohydrate vs HCL: Which One Actually Works Better?

Creatine monohydrate wins for almost every UK buyer: it costs less, has far more research behind it, and the only recent head-to-head trial found creatine HCL gave no extra benefit, while HCL costs 1.6 to 1.9 times as much per gram at the same retailer.

KE

Kevin, founder of WheyWise

24 April 2026Updated 4 October 20267 min read

Quick answer

Buy monohydrate. Creatine HCL costs 1.6 to 1.9 times as much per gram at the same retailer, and the 2024 head-to-head trial found it gave no extra strength or muscle: Bulk Creatine HCL is £17.99 for 500g against £10.99 for Bulk Creatine Monohydrate. The cheapest monohydrate from a major brand in our price data is Protein Works Creatine Monohydrate, at 10p per 5g in the £19.99 1kg bag. HCL is only worth a try if monohydrate genuinely upsets your stomach. WheyWise compared every price against UK retailer data.

Creatine monohydrate wins for almost every UK buyer: it costs less, has far more research behind it, and the only recent head-to-head trial found creatine HCL gave no extra benefit. Creatine HCL is a newer form marketed as more soluble and easier on the stomach. The solubility advantage is real, but it does not translate into better strength or muscle gain, and at the same retailer it costs 1.6 to 1.9 times as much per gram.

Key fact: In an eight-week trial (Eghbali et al., 2024), 40 people aged 18 to 25 did resistance training while taking creatine HCL, creatine monohydrate or a placebo. Both forms improved strength, muscle size and hormonal response compared with placebo, and the authors found creatine HCL showed no benefit over monohydrate.

What are creatine monohydrate and creatine HCL?

Creatine monohydrate is creatine bonded to a water molecule. Creatine HCL (creatine hydrochloride) is creatine bonded to hydrochloric acid. Both deliver the same active compound to muscle tissue. Creatine monohydrate has been the subject of hundreds of peer-reviewed studies since the 1990s. Creatine HCL carries a much thinner research base.

The two forms are marketed differently. Creatine monohydrate sells on price and clinical track record. Creatine HCL sells on solubility and the claim that smaller doses work as well as larger monohydrate doses. The second claim is the one buyers should scrutinise.

Is creatine HCL more soluble than monohydrate?

Yes. Creatine HCL dissolves far more readily in water than creatine monohydrate, and this is the one claim that HCL marketing gets right. Standard creatine monohydrate can leave visible grit at the bottom of a shaker in cold water; creatine HCL dissolves fully. Users who find monohydrate gritty often cite this as their reason for switching.

Micronised or ultra-fine creatine monohydrate closes most of the solubility gap. The particle size is reduced so the powder mixes into water, protein shakes, or juice without clumping. Optimum Nutrition Micronised Creatine is one example, and Protein Works describes its Creatine Monohydrate as ultra-fine 200 mesh powder, so solubility is rarely a genuine deciding factor.

Does better solubility mean better results?

No. In the 2024 trial cited above, both groups took the same dose, 0.03g per kg of bodyweight, through eight weeks of resistance training at 70 to 85% of their one-rep max. Strength, muscle cross-sectional area and skeletal muscle mass rose in both creatine groups compared with placebo, and creatine HCL showed no benefit over monohydrate.

Note what that trial did not test. HCL brands often suggest you can take less, but the trial gave both forms at the same dose by bodyweight, so it offers no support for the idea that a smaller HCL dose matches a normal monohydrate dose.

The mechanism explains the result. Creatine saturation in muscle is determined by total daily creatine intake, not by how quickly a single dose dissolves in water. Once muscle creatine stores hit saturation (typically 3 to 4 weeks at 3 to 5 grams per day), adding more creatine produces no further benefit. Solubility affects drink texture, not the biology.

How much more does creatine HCL cost?

Creatine HCL costs 1.6 to 1.9 times as much per gram as monohydrate from the same brand in the UK. Bulk Creatine HCL is £17.99 for 500g against £10.99 for Bulk Creatine Monohydrate, 64% more. MyProtein Creatine HCL is £30.49 for 500g against £15.99 for MyProtein Impact Creatine, 91% more.

ProductFormPack and pricePer gramPer 5g
Protein Works Creatine MonohydrateMonohydrate1kg, £19.992.0p10p
Bulk Creatine MonohydrateMonohydrate500g, £10.992.2p11p
MyProtein Impact CreatineMonohydrate500g, £15.993.2p16p
Bulk Creatine HCLHCL500g, £17.993.6p18p
MyProtein Creatine HCLHCL500g, £30.496.1p30p

Bulk prices from bulk.com, the others from WheyWise price data for myprotein.com and theproteinworks.com. Unflavoured where available.

The same gap shows up in the wider market. A 2022 audit of 175 creatine products on Amazon.com (Escalante et al., 2022) found creatine monohydrate averaged $0.12 per gram against $0.26 for alternative forms of creatine, and classed about 88% of the alternative products as having limited or no evidence behind them.

The cost delta compounds over a year. At 5g a day, Protein Works Creatine Monohydrate costs about £36 a year, while MyProtein Creatine HCL at the same 5g a day costs about £111. The price premium buys improved solubility and nothing else that the research supports.

Which form should you pick?

Pick creatine monohydrate unless one specific criterion applies:

  • You have previously tried monohydrate and experienced persistent digestive discomfort that did not resolve when switching to a micronised version. Creatine HCL does have anecdotal reports of better GI tolerance.
  • You strongly prefer clean drink texture and find micronised monohydrate still grittier than you can tolerate.
  • You are willing to pay 1.6 to 1.9 times as much per gram for the above with no performance return.

If none of those apply, creatine monohydrate is the rational pick. For competitive athletes subject to banned-substance testing, choose a batch-tested tub over an untested one: MyProtein Impact Creatine, for example, is Informed Choice certified. The third-party testing matters more than the creatine form.

UK creatine picks

The cheapest monohydrate per 5g dose from a major UK brand costs 10p. The WheyWise creatine comparison table ranks current UK options by cost per 5g, Creapure status, and third-party testing. Three products to start with:

Cheapest monohydrate per 5g

Protein Works Creatine Monohydrate

Protein Works Creatine Monohydrate

500g bag

Pros

  • 10p per 5g in the 1kg bag at £19.99
  • Ultra-fine 200 mesh powder, so it mixes cleanly
  • Unflavoured, Berry Blitz or Orange Burst

Cons

  • No Creapure source or batch-testing certification stated
  • The 250g tub costs 14p per 5g, so buy the 500g or 1kg
Buy Creatine Monohydrate →Price at Protein Works
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or compare all UK prices →

Informed Choice tested

MyProtein Impact Creatine x Chupa Chups

MyProtein Impact Creatine x Chupa Chups

250g bag

Pros

  • Informed Choice certified for banned substances
  • 16p per 5g in the 500g tub, 14p in the 1kg
  • Flavours include Berry Burst, Blue Raspberry, Tropical and Vimto

Cons

  • The 3.4g scoop is below the 5g dose used in this guide
  • 40% dearer per gram than Protein Works in the 1kg size
or compare all UK prices →

If monohydrate upsets your stomach

Bulk Creatine HCL Powder - Creatine Hydrochloride - Fast Absorbing - High Intensity Workout - Post Workout Creatine

Bulk Creatine HCL Powder - Creatine Hydrochloride - Fast Absorbing - High Intensity Workout - Post Workout Creatine

500g bag

Pros

  • Dissolves fully in water, with no grit
  • £17.99 for 500g, the cheaper of the two HCLs we track
  • 3g serving on the label

Cons

  • 64% dearer per gram than Bulk Creatine Monohydrate
  • No trial shows HCL builds more strength or muscle than monohydrate
or compare all UK prices →
Bottom line: Creatine monohydrate beats creatine HCL on cost and research depth. Creatine HCL is more soluble but that does not translate into better results, and it costs 1.6 to 1.9 times as much per gram. Pick monohydrate unless you have a specific tolerance or texture reason to pay more. Compare live prices on the creatine comparison table.

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