Creatine Monohydrate vs Creatine HCl: Two Small Trials vs a Deep Evidence Base
Creatine HCl dissolves far better in water, but better solubility has not translated into reliably bigger gains. In the two trials that tested both forms in people, one found a tie and one found HCl ahead on jump, sprint and power tests, with 10 people per group.
By Kymata Health Editorial Published Last checked
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Momentous Creatine, 90 servings
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Label: 1 scoop (5 g): 5 g creatine monohydrate.
Best for regular use: $32.24 on subscription vs $42.99 one-time (checked Oct 15, 2026).
Key takeaways
From 8 sources- In an 8-week resistance training trial in 40 young adults, creatine HCl and monohydrate both beat placebo for strength and muscle size, and HCl showed no benefit over monohydrate1.
- In a 4-week sprint training trial in 40 soccer players, HCl and ethyl ester groups gained more than monohydrate on jump, sprint, agility and peak power; each group had 10 players2.
- HCl was 38 times more water-soluble than monohydrate in the lab, but gut-cell permeability did not differ3.
- A critical review of marketed creatine forms concluded that monohydrate is the only one with substantial evidence for bioavailability, effectiveness and safety4.
- Stomach upset tracked with serving size: in soccer players taking creatine, diarrhoea was more common after one 10 g serving than after two 5 g servings5.
What this article covers
1 evidence profileThe evidence, graded
Pulled from the trial tables in our evidence profiles. Grades follow our evidence-grading policy.
Graded findings
3 rows- DGrade DStrength and muscle size with creatine HClImproved Both HCl and monohydrate increased strength, muscle cross-sectional area and skeletal muscle mass more than placebo. Creatine HCl showed no benefit over monohydrate.Creatine monohydrate · RCT · n=40 · 2024 · PMID 39545789
- DGrade DSprint and jump performance with creatine HClImproved All creatine groups improved physical performance, peak power and fatigue index more than placebo. HCl and ethyl ester groups gained more than monohydrate on jump, 20-m sprint, L-run agility and peak power; no differences in mean power or VO2max.Creatine monohydrate · RCT · n=40 · 2026 · PMID 42720250
- AGrade AMuscle strength with resistance trainingImproved Versus placebo, upper-body strength +4.43 kg and lower-body strength +11.35 kg. Gains were significant in men; women showed no significant gains, but only 2 trials (40 women) were female-only.Creatine monohydrate · Meta-analysis · n=509 · 2024 · PMID 39519498
Safety at a glance
From our Creatine monohydrate evidence profilePublished interactions and cautions only. Each one is cited on our Creatine monohydrate evidence profile, with its own numbered sources.
Interactions
- Caffeine
- In 9 men, caffeine taken during a 6-day creatine load left the 4–6% phosphocreatine rise intact but wiped out the 10–23% torque gain seen with creatine alone.
Who should be careful
- Medicines
- NIH ODS lists no drug interactions for creatine. That means none are published in that source, not that creatine is safe with every medicine.
- Kidney
- A 2025 meta-analysis found a small rise in serum creatinine (significant at follow-ups under 1 week and over 12 weeks, not at 1–12 weeks) with no significant change in glomerular filtration rate. Because creatinine is a routine kidney test, this can complicate lab results. Trials mostly enrolled healthy people, so anyone with kidney disease or reduced kidney function should discuss creatine with their clinician first.
- Pregnancy and breastfeeding
- Insufficient human safety data. Creatine occurs naturally in breast milk, but LactMed notes milk levels have not been measured after supplementation and that creatine can raise an infant's serum creatinine, which may skew kidney-function estimates. LactMed advises avoiding creatine supplements while breastfeeding unless a clinician prescribes them.
- Liver
- No liver-specific human safety data in our sources.
What actually differs between the two
Both products deliver creatine. Monohydrate is the standard crystalline form; creatine HCl is a hydrochloride salt of creatine3. In a laboratory comparison of creatine salts, the hydrochloride was 38 times more soluble in water than monohydrate3.
Solubility is the main selling point, but it is not the same as absorption. In the same study, creatine HCl and monohydrate moved across a layer of human gut cells at similar rates3. For monohydrate itself, close to 99% of an oral dose is either taken up by muscle or excreted in urine, which leaves little room for another form to be absorbed meaningfully better6.
The head-to-head trials
An 8-week trial split 40 adults aged 18 to 25 into four groups of 10: creatine HCl, monohydrate with a loading phase, monohydrate without loading, or placebo, all alongside resistance training1. HCl was given at 0.03 g per kg of body weight a day, the same daily dose as the non-loading monohydrate group, so the trial did not test the claim that a smaller HCl dose works as well1. Every creatine group gained more strength and muscle than placebo, and the authors reported no benefit of HCl over monohydrate1.
A 4-week trial in 40 collegiate soccer players compared monohydrate, ethyl ester, HCl and placebo during repeated-sprint training2. All creatine groups improved peak power and fatigue index more than placebo, and the HCl and ethyl ester groups improved more than the monohydrate group on jump height, 20 m sprint, agility and peak power2. Mean power and VO2max did not differ between groups2.
With 10 people per group, both trials are too small to settle the question, and they point in different directions12.
Why monohydrate is the default
Monohydrate is the most extensively studied form6. In a meta-analysis of 23 creatine trials in adults under 50 doing resistance training, creatine added about 4.4 kg to upper-body and 11.4 kg to lower-body strength gains compared with placebo; most participants were men7.
The International Society of Sports Nutrition reports that short- and long-term creatine intake, up to 30 g a day for 5 years, has been safe and well tolerated in healthy people in the studies it reviewed8. A critical review of marketed forms found that monohydrate remains the only one with substantial evidence for bioavailability, efficacy and safety4. Two of that review's three authors consult for the supplement industry and once filed creatine patents, now expired or abandoned, while employed by an ingredient company4.
Stomach upset and the bloating question
The case for HCl rests partly on the idea that monohydrate's low solubility causes stomach discomfort3. Neither head-to-head trial reported comparative stomach symptoms in its abstract12.
For creatine in general, serving size seems to matter. In 59 soccer players taking creatine or placebo for 28 days, diarrhoea affected 55.6% of those taking one 10 g serving, 28.6% of those taking two 5 g servings and 35.0% on placebo5. Splitting larger amounts across the day is the approach that study supports5.
Which one fits you
For the full evidence tables, see the creatine monohydrate page, plus whether a loading phase is needed and creatine gummies versus powder.
The evidence leaves a short list of practical points:
- Want the form most studies used: monohydrate is the form behind most of the strength and safety data47.
- Get stomach upset from creatine: smaller, split servings cut diarrhoea compared with one 10 g serving5.
- Want to try HCl: one small trial found it matched monohydrate at the same dose and another found it ahead on sprint tests, so any advantage remains unproven12.
- Have kidney disease or take medicines that affect the kidneys: ask your clinician before starting any form, since the safety summary above refers to healthy people8.
Quick answers
Common questions
3 answersDoes creatine HCl need a smaller dose?
That claim has not been tested well. The 8-week trial gave HCl at the same 0.03 g per kg a day as maintenance monohydrate, and found no advantage for HCl1.
Is creatine HCl absorbed better?
Is creatine monohydrate safe long term?
In the studies reviewed by the International Society of Sports Nutrition, intakes up to 30 g a day for 5 years were safe and well tolerated in healthy people8.
Keep reading
Full evidence profiles
Every graded study, studied doses, interactions and safetyRelated articles
4 articles- ArticleCreatine After 50: What It Does for Muscle, Memory and Bone (and What It Doesn’t)Is creatine good for people over 50?
- ArticleCreatine for Women Over 50, in Menopause, or on a GLP-1: What the Trials SupportShould women over 50, in menopause or on a GLP-1 take creatine?
- ArticleCreatine for Your Brain: What Trials Show for Memory, Sleep Loss and DepressionDoes creatine improve brain function?
- ArticleCreatine Gummies vs Powder: Two Lab Rounds Found Gummies With Little or No CreatineAre creatine gummies as good as creatine powder?
More on Supplements and vitamins
8 pages- TopicSupplements and vitamins: every page
- PreviousCreatine Loading Phase: Do You Need It, and Why Did the Scale Just Jump?Twenty grams a day for a week, or a few grams from day one?
- NextD-Mannose for UTIs: Early Trials Looked Promising, but the Largest Placebo Trial Found No BenefitD-mannose is a simple sugar sold to stop repeat urinary tract infections.
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- ToolEvidence-graded supplement stacks
- TopicsBrowse all topics
Browse the full Supplement & Nutrient Encyclopedia or all supplement articles.
Where to buy Creatine monohydrate
Products from brands we partner with that contain Creatine monohydrate. Check the amount per serving against the doses studied, and the label for other ingredients.
Creatine monohydrate products from partner brands
6 products Paid links · we earn a commission- Quick pickMomentousMomentous Creatine, 90 servingsWe use this brand at home. What we useSubscribe & save 25%
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1 scoop (5 g): 5 g creatine monohydrate; 90 servings
$42.99one-time$32.24subscribeChecked Oct 15, 2026 - MomentousMomentous Creatine Chews, 150 countWe use this brand at home. What we useSubscribe & save 25%
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Pick “Subscribe 25% Off” on the product page; delivery every 1, 2 or 3 months; cancel or reschedule anytime.
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1 chewable tablet: 1 g creatine monohydrate with 1 g added sugar; 150 chews
$49.99one-time$37.49subscribeChecked Oct 19, 2026 - Supersmart3-Creatine5% off with the Supersmart newsletterGet 5% off with the newsletter (paid link, opens in new tab)
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1 scoop (3.5 g): 3 g creatine, mostly from creatine monohydrate (3,360 mg) with small amounts of creatine phosphate and pyruvate; 70 servings
$29.00one-time$24.65subscribeChecked Oct 11, 2026 - HerbsProNOW Foods Creatine Monohydrate Micronized Powder, 1.1 lb
1.5 level teaspoons per serving; listing states 4.5 g creatine monohydrate per serving
$20.09one-timeChecked Oct 12, 2026 - OnnitOnnit Creatine, unflavored (90-serving tub)We use this brand at home. What we useSubscribe & Save 15%
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Choose Subscribe & Save on the product page; skip, swap or cancel anytime.
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AGrade A, strong (Grade A) 5 g creatine monohydrate per scoop, the daily amount behind most strength and lean-mass trials.
Onnit does not ship this product to New York.
1 scoop (5 g): 5 g creatine monohydrate; 90 servings
$37.99one-time$32.30subscribeChecked Oct 20, 2026 - Dr. TobiasDr. Tobias Creatine Monohydrate (90 tablets)
3 tablets: 4.8 g creatine monohydrate plus 150 mg creatine pyruvate and 51 mg creatine alpha-ketoglutarate
$12.99one-timeChecked Oct 14, 2026
References
8 sources. Numbers in the text link here.
Sources cited in this article
8 sources- 1Supplementing With Which Form of Creatine (Hydrochloride or Monohydrate) Alongside Resistance Training Can Have More Impacts on Anabolic/Catabolic Hormones, Strength and Body Composition?Physiol Res, 2024 · PMID 39545789
- 2Creatine formulations and repeated sprint training: effects on physical and physiological adaptations in soccer players during the short-term preparation phaseJ Int Soc Sports Nutr, 2026 · PMID 42720250
- 3Physicochemical characterization of creatine N-methylguanidinium saltsJ Diet Suppl, 2010 · PMID 22432515
- 4Bioavailability, Efficacy, Safety, and Regulatory Status of Creatine and Related Compounds: A Critical ReviewNutrients, 2022 · PMID 35268011
- 5Gastrointestinal distress after creatine supplementation in athletes: are side effects dose dependent?Res Sports Med, 2008 · PMID 18373286
- 6Analysis of the efficacy, safety, and regulatory status of novel forms of creatineAmino Acids, 2011 · PMID 21424716
- 7Effects of Creatine Supplementation and Resistance Training on Muscle Strength Gains in Adults <50 Years of Age: A Systematic Review and Meta-AnalysisNutrients, 2024 · PMID 39519498
- 8International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicineJ Int Soc Sports Nutr, 2017 · PMID 28615996
Creatine monohydrate and other dietary supplements are not intended to diagnose, treat, cure or prevent any disease, and these statements have not been evaluated by the FDA. Talk to your clinician or pharmacist before starting a supplement, especially if you take prescription medicines. Product links on this page are paid partner links.