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The HCl marketing has been the most expensive lesson in creatine pricing I've watched men make. I ran HCl for two months and saw exactly the same strength numbers I got from monohydrate at a third of the price. Save the money for groceries.
Walk into any supplement shop or browse a major retailer online and you will find creatine products at a range of price points. Standard creatine monohydrate might cost £15-25 for a kilogram. Creatine HCl products often run to £30-50 for a fraction of that amount. The marketing on HCl products emphasises superior bioavailability, smaller required doses, and fewer side effects. The research tells a different story.
What the Difference Actually Is
Creatine monohydrate is creatine bound to a water molecule. It is the form used in the vast majority of published research, and it is the default recommendation across sports nutrition scientific bodies.
Creatine HCl (hydrochloride) is creatine bound to hydrochloric acid. The binding changes the molecule's physical properties, most notably its solubility. Creatine HCl dissolves substantially more readily in water than monohydrate, which is the basis for most of the manufacturer claims around it.
Because HCl is more soluble, supplement companies argue that the body can absorb it more efficiently, allowing you to take a smaller dose (typically 750mg-1g per day) compared to the standard 3-5g of monohydrate. This is where the legitimate science ends and the marketing begins.
The Solubility Argument
It is true that creatine HCl is more soluble in water. In a lab setting, HCl dissolves more easily and completely than monohydrate at room temperature. This property is observable and real.
The problem is that solubility in a glass of water does not straightforwardly translate to superior absorption in the human gut. The stomach is an acidic environment, and creatine monohydrate is substantially converted to a soluble form during digestion. The solubility advantage of HCl, while real at neutral pH, is largely irrelevant once you account for the acidic conditions of gastric digestion.
The manufacturers' claim that you can take a smaller dose and achieve equivalent or better results has not been substantiated in clinical research under controlled conditions.
The Evidence Problem
This is the core issue with creatine HCl: there are no peer-reviewed studies directly comparing it to creatine monohydrate that demonstrate superior outcomes for strength, muscle mass, athletic performance, or any other meaningful marker.
This is not a marginal gap in the literature. Creatine monohydrate has over 500 published studies. Creatine HCl has a small number of in vitro studies examining its solubility properties and minimal human clinical trial data. The absence of head-to-head clinical evidence is a significant problem when manufacturers are charging a large premium and making performance claims.
The position of the International Society of Sports Nutrition (ISSN) is clear: creatine monohydrate is the most effective and well-supported form, and there is insufficient evidence to recommend other forms over it. For a fuller picture of why this matters specifically as you age, see my complete guide to creatine for men over 40.
The Price Reality
Consider what the price premium means in practice. A kilogram of quality creatine monohydrate from a reputable UK brand costs approximately £15-25. That provides 200-333 servings at a 3-5g daily dose, or roughly 6-11 months of supplementation.
A typical creatine HCl product might cost £35-45 for 90 capsules at 750mg each. At the claimed equivalent dose, that is a 90-day supply. The per-day cost of HCl is often three to five times higher than monohydrate, with no corresponding benefit supported by clinical evidence.
For a supplement you should be taking consistently over months and years, this price difference is substantial. The money spent on HCl premium pricing is money that could be used on a better diet, additional whole food protein sources, or other evidence-based supplements.
The One Legitimate Use Case
The most credible argument for creatine HCl is that it may cause less gastrointestinal discomfort in individuals who are genuinely sensitive to creatine monohydrate. Some people experience bloating or mild digestive discomfort when taking monohydrate, particularly in larger doses. HCl's superior solubility means it may sit more comfortably in the gut for these individuals.
If you have tried monohydrate at 3-5g daily and consistently experienced GI issues, HCl is a reasonable alternative to consider. This is a small subset of users. At 3-5g doses, GI tolerance problems with monohydrate are uncommon, and they are often resolved by taking the creatine with food rather than on an empty stomach.
For the majority of men, this does not apply.
The Creapure Option
If you want the best creatine monohydrate rather than a cheaper generic, Creapure is the answer, not HCl. Creapure is a pharmaceutical-grade creatine monohydrate produced in Germany by AlzChem Trostberg GmbH. It undergoes rigorous quality testing, has exceptional purity (99.99%+), and is the form used in many of the highest-quality academic studies.
Several UK brands include Creapure-sourced creatine, including Myprotein's Creapure variant. The premium over standard monohydrate is modest, often just a few pounds per kilogram, and it buys you verified purity and quality control. That is a meaningful upgrade for a supplement you will take daily for years.
Creapure monohydrate at a modest premium versus generic monohydrate is a well-reasoned choice. Paying three to five times more for creatine HCl is not.
The Bottom Line
Creatine monohydrate. Every time, unless you have documented GI intolerance that does not resolve with food co-ingestion. Choose Creapure if you want the premium tier, and spend the difference on food — or on the best protein powder UK options you actually use every day.
For a full comparison of UK creatine products, see the best creatine supplements UK guide.
Plain monohydrate (ideally Creapure-sourced) at 3-5g daily. HCl earns its place only if you have documented GI intolerance to monohydrate that food co-ingestion doesn't fix. Otherwise it's a marketing tax.
For a full comparison of UK creatine products including pricing, sourcing, and our top picks, see the best creatine supplements in the UK.
