Creatine Monohydrate vs Other Forms

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If you are comparing creatine monohydrate vs other forms — HCL, citrate, gluconate, pyruvate, ethyl ester, kre-alkalyn, micronized — here is the short answer: the ISSN position stand (Kreider et al., 2017) states that, at present, creatine monohydrate is the most extensively studied and clinically effective form of creatine for use in nutritional supplements in terms of muscle uptake and ability to increase high-intensity exercise capacity. The other forms are mostly sold on solubility, stomach comfort or “better absorption”, and the research reviews we checked found little to no evidence that any of them beats it. This guide takes each form in turn and answers three questions: how much creatine is in a gram of powder, what the studies found, and what it means for your money.

• Micronized creatine is monohydrate milled finer. Same molecule, smoother mixing.
• Anhydrous creatine is monohydrate with the water dried out, so a gram holds more creatine — the dose just has to be adjusted.
• Creatinine is not a form of creatine. It is the waste product that creatine breaks down into.
• “Is all creatine monohydrate the same?” Same molecule, but purity can differ — see the purity section below.

The box above is the official EU wording and its condition of use. Everything below is editorial comparison of the different forms. None of this is medical advice — it is information to help you read a label with clear eyes. If you have a health condition or take medication, speak to a healthcare professional before starting any supplement.

Why creatine monohydrate is the reference point

When researchers study creatine, they almost always study creatine monohydrate. The International Society of Sports Nutrition (ISSN) position stand calls it the most extensively studied and clinically effective form of creatine for nutritional supplements in terms of muscle uptake and the ability to increase high-intensity exercise capacity (Kreider et al. 2017). A 2011 review of the newer forms reached a matching conclusion: there is little to no evidence that any of them is more effective or safer than monohydrate, whether taken alone or with other nutrients (Jäger et al. 2011).

Chemically, monohydrate is creatine bound to a single water molecule. The ISSN position stand notes that the vast majority of studies assessing the efficacy of creatine supplementation on muscle phosphagen levels, whole body creatine retention and/or performance have evaluated creatine monohydrate (Kreider et al., 2017). The other forms exist to solve problems (real or marketed) that monohydrate is said to have, so let’s look at each on its own terms. For a closer look at the trial evidence behind monohydrate itself, see our breakdown of what the research actually says.

What “monohydrate” means — and what anhydrous, “pure” and “pharmaceutical grade” mean

The “mono-hydrate” in the name is one water molecule per creatine molecule. By weight, creatine monohydrate is 87.9% creatine (Kreider, Jäger & Purpura 2022). Dry it at around 100 °C and the water leaves, giving creatine anhydrous, which is 100% creatine by weight — about 14% more creatine per gram of powder. The same review notes that the heat used in drying leaves more creatinine impurity in anhydrous creatine, and that monohydrate separates into creatine and water once swallowed. In practice the difference is a dosing detail, not a better molecule.

“Pure creatine”, “pharmaceutical grade” and similar phrases are not chemical forms. To know what you are buying, read the ingredient line (it should say creatine monohydrate or creatine anhydrous), then look for a named raw material or a laboratory test certificate. Our guide on how to read a supplement label walks through the rest of the label.

Creatine vs creatinine: why they are not two forms of the same thing

Creatinine is what creatine turns into when it breaks down. Your body converts about 1–2% of the creatine in muscle to creatinine each day and excretes it in urine (Kreider et al. 2017). The same conversion happens in a drink: creatine is relatively stable in solution at neutral pH, but after three days at 25 °C about 4% had converted at pH 5.5, 12% at pH 4.5 and 21% at pH 3.5. That is the main reason creatine is sold as a dry powder, and a practical reason to mix a serving and drink it rather than leaving it sitting in an acidic drink. Creatinine is also a contaminant you do not want in the tub, which brings us to purity.

Form by form: what the evidence actually says

Creatine HCL (hydrochloride)

Creatine HCL binds creatine to hydrochloric acid, which makes it far more soluble in water. That is its genuine selling point: it dissolves cleanly and is often sold in smaller serving sizes, which some people find easier on the stomach. By weight it carries about 78% creatine against monohydrate’s 87.9%, so a gram of HCL gives you less creatine than a gram of monohydrate. If you dislike the slight grittiness of monohydrate or have felt mild bloating, HCL can be a reasonable personal preference.

What it lacks is the same depth of evidence. The “38 times more bioavailable” figure used in marketing appears to trace back to a solubility measurement taken at very different acidity for the two forms (pH 0.3 for HCL against pH 8.6 for monohydrate), and the 2022 critical review points out that dissolving more creatine in water does not by itself change how much your body takes up (Kreider, Jäger & Purpura 2022). If solubility genuinely bothers you, a micronized monohydrate (more on that below) often solves the same problem at a fraction of the price.

Creatine citrate

Creatine citrate (usually tri-creatine citrate) binds creatine to citric acid. It does dissolve better: about 29 g/L in water at 20 °C against 14 g/L for monohydrate (Jäger et al. 2011). But it is only about two-thirds creatine by weight, so you need roughly one and a half times as much powder to get the same amount of creatine. No published evidence we checked shows it raises muscle creatine or performance more than monohydrate, which usually makes it a worse deal per gram of creatine, not a better one.

Creatine pyruvate

Creatine pyruvate is about 60% creatine by weight and dissolves even more readily than citrate (54 g/L at 20 °C, compared with 14 g/L for monohydrate). Those are measurable properties of the powder in a glass of water. Dissolving better is not the same as working better, and the 2011 review of novel forms found little to no evidence that any of the newer forms, pyruvate included, is more effective than monohydrate (Jäger et al. 2011).

Creatine gluconate

Creatine gluconate pairs creatine with gluconic acid and is marketed on the idea of insulin-mediated uptake into muscle. It is the most dilute form in the 2011 comparison: about 40% creatine by weight, less than half of monohydrate’s share. The 2011 review of the newer forms found little to no evidence that any of them is more effective than monohydrate (Jäger et al. 2011).

Creatine phosphate

Phosphocreatine is the molecule your muscles already use as a fast energy store, which is why “creatine phosphate” sounds as if it should be better than plain creatine. The supplement version, sodium creatine phosphate, is about 51% creatine by weight, roughly 40% less than monohydrate per gram (Jäger et al. 2011), and the same review found little to no evidence that any of the newer forms is more effective than monohydrate. Treat it as a diluted form, not a shortcut.

Kre-alkalyn (buffered creatine)

Kre-alkalyn is a buffered creatine — monohydrate processed to a higher pH on the theory that it resists conversion to creatinine in the stomach, so less is “wasted”. It is marketed as a more efficient form, sometimes implying you need a smaller dose to get the same effect.

This has been tested directly. In a double-blind trial of 36 resistance-trained people, Kre-alkalyn at the manufacturer’s recommended 1.5 g/day, and at the same doses as monohydrate, did not produce greater changes in muscle creatine, body composition, strength or anaerobic capacity than monohydrate (Jagim et al. 2012). The authors concluded that the results do not support claims that a buffered form is more effective or safer.

Micronized creatine: still monohydrate

This is the one that trips people up, so let’s be unambiguous: micronized creatine is still creatine monohydrate. “Micronized” describes the particle size, not the molecule. The same monohydrate powder is simply milled finer, so it mixes more smoothly, settles less and is easier to drink.

Micronized monohydrate is the same molecule as ordinary monohydrate, and it gives you the smooth mixing that draws people toward forms like HCL. Many products, including the ones tracked here, use micronized monohydrate for exactly this reason. Compare unflavoured creatine monohydrate prices in Malta and Cyprus.

Creatine ethyl ester

Creatine ethyl ester (CEE) attaches an ester group to the creatine molecule, with the marketing claim that this improves uptake into muscle. In a seven-week, double-blind controlled trial of 30 men who were not resistance-trained and followed a resistance-training programme (Spillane et al. 2009, JISSN), serum creatine was lower with CEE than with monohydrate or placebo, and muscle creatine did not differ between CEE and monohydrate. There were no significant differences between groups in strength or body composition, and serum creatinine (a waste product) was higher with CEE than with monohydrate or placebo. By weight CEE is about 82% creatine, so it is also a little more dilute, and it typically costs more.

Creapure and the “HPLC vs Creapure” question

This one is a different kind of question — it is not about a different molecule, it is about purity. Creapure is a branded creatine monohydrate, manufactured in Germany. The 2022 review describes it as 99.9% pure monohydrate made with water as the solvent, with no contaminants. So “HPLC vs Creapure” is not a head-to-head between two forms of creatine — HPLC (high-performance liquid chromatography) is a laboratory test, Creapure is a raw-material brand. Any creatine monohydrate can be tested by HPLC; a named raw material or a test certificate is how you tell which tubs have been.

Is all creatine monohydrate the same? Purity

The molecule is the same; the purity is not guaranteed to be. The 2022 review notes that monohydrate made by processes using different chemical precursors, organic solvents or looser filtration has been reported to contain by-products such as dicyandiamide, dihydrotriazine and creatinine, and in some cases higher levels of heavy metals (Kreider, Jäger & Purpura 2022). That is the real reason to look past the front of the tub. Three quick checks: the label names the ingredient as creatine monohydrate and gives the grams of creatine per serving; the maker names the raw material or publishes a laboratory certificate for the batch; and the price per gram of creatine (not per tub) is in line with other monohydrate products. Our Creapure price comparison for Cyprus shows how large the price spread can be for one and the same licensed raw material.

How the forms compare at a glance

The ISSN position stand notes that the vast majority of studies assessing the efficacy of creatine supplementation on muscle phosphagen levels, whole body creatine retention and/or performance have evaluated creatine monohydrate (Kreider et al. 2017, ISSN position stand). The same position stand states that clinical evidence has not demonstrated that different forms of creatine, such as creatine citrate, creatine ethyl ester or buffered forms of creatine, promote greater creatine retention than creatine monohydrate.

How to compare the price of different creatine forms

Compare the price per gram of creatine, not the price per tub. Multiply the pack weight by the creatine share in the table above, then divide the price by that number. As a worked example with made-up round numbers (not a tracked price): a 500 g tub of monohydrate at €15 holds about 440 g of creatine, which is roughly €3.40 per 100 g of creatine. A 500 g tub of citrate at the same €15 holds about 330 g of creatine, roughly €4.50 per 100 g — a third more for the same creatine. Our live tables normalise listings per 100 g of product, so check the creatine share when you compare a non-monohydrate form.

So which creatine is best — and is expensive creatine worth it?

Which form suits you depends on your budget and on what you value, such as solubility or taste. The ISSN position stand describes 3–5 g/day as the amount that generally maintains muscle creatine stores once they are full (Kreider et al. 2017). HCL really is more soluble, and some people prefer it. The 2011 review of novel forms of creatine (Jäger et al., 2011) found little to no evidence that any of the newer forms is more effective or safer than monohydrate.

Spend the premium only if a specific, personal reason justifies it — for example, you have tried micronized monohydrate and still prefer how HCL sits with you. For the wider context, see our creatine monohydrate pillar guide, get the numbers right in our creatine dosage guide, and read the study-by-study picture in what the research actually says about creatine.

Authorised EU health claim wording and conditions of use are published in the EU Register of nutrition and health claims made on foods: ec.europa.eu — EU Register of health claims.

Related: start at the creatine monohydrate pillar guide, dial in your dose with the creatine dosage guide, or go straight to unflavoured creatine monohydrate prices.

Frequently asked questions

Which creatine is best?

The ISSN position stand on creatine (Kreider et al., 2017) states that, at present, creatine monohydrate is the most extensively studied and clinically effective form of creatine for use in nutritional supplements in terms of muscle uptake and ability to increase high-intensity exercise capacity. The exact EU-authorised wording is shown in the box on this page.

Creatine monohydrate vs HCL: which should I pick?

Creatine HCL is more soluble and some people find it gentler on the stomach, so it can be a personal preference. But the ISSN position stand notes that the vast majority of studies assessing the efficacy of creatine supplementation on muscle phosphagen levels, whole body creatine retention and/or performance have evaluated creatine monohydrate (Kreider et al., 2017), and HCL usually costs more per gram. If solubility is your only concern, a micronized monohydrate solves that for less money.

Is micronized creatine better than monohydrate?

Micronized creatine is creatine monohydrate — the same molecule, just milled into finer particles so it mixes more smoothly.

Is expensive creatine worth it?

Forms like HCL, kre-alkalyn and ethyl ester are marketed on solubility or absorption. A 2011 review of newer creatine forms in general (Jäger et al.) found little to no evidence that any of them is more effective than plain monohydrate, and a 2012 trial of Kre-Alkalyn itself (Jagim et al.) found no greater changes in muscle creatine, body composition or training adaptations than with monohydrate. Pay more only if you have a specific personal reason to.

Is buffered creatine (kre-alkalyn) more effective?

Kre-alkalyn is pH-buffered monohydrate sold on the idea that less is wasted before absorption; the ISSN position stand (Kreider et al., 2017) says clinical evidence has not demonstrated that buffered forms of creatine promote greater creatine retention than creatine monohydrate. The same position stand describes monohydrate as the most extensively studied form of creatine for nutritional supplements.

Sources & further reading

1. Kreider et al. 2017 — ISSN position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine (JISSN, PMC)
2. Jäger, Purpura, Shao, Inoue & Kreider 2011 — Analysis of the efficacy, safety, and regulatory status of novel forms of creatine (Amino Acids, PMC)
3. Kreider, Jäger & Purpura 2022 — Bioavailability, Efficacy, Safety, and Regulatory Status of Creatine and Related Compounds: A Critical Review (Nutrients, PMC)
4. Spillane et al. 2009 — Creatine ethyl ester supplementation combined with heavy resistance training (JISSN, PMC)
5. Jagim et al. 2012 — A buffered form of creatine does not promote greater changes in muscle creatine content, body composition, or training adaptations than creatine monohydrate (JISSN, PMC)
6. EU Register of authorised nutrition and health claims made on foods (creatine claim wording & conditions)