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Glossary

What does monohydrate mean?

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

Monohydrate means each molecule of a compound is paired with one molecule of water, built into its crystals. Creatine monohydrate is the common example: creatine crystallizes holding one water molecule per creatine molecule, so the powder is about 88% creatine by weight. Drying it near 100 degrees Celsius gives anhydrous creatine.1,2,3

Key facts

  • Creatine monohydrate is 88% creatine by weight and is the most widely used and studied form of creatine.2
  • PubChem records creatine monohydrate as a 1:1 hydrate of creatine, with a molecular weight of 149.15.3
  • A 2011 review puts creatine monohydrate at 87.9% creatine and anhydrous creatine at 100%.1
  • NIH notes that other, usually more expensive forms of creatine have not been shown to beat the monohydrate on muscle creatine, digestibility, stability or safety.2

Hydrates in plain words

Some compounds take water into their crystal structure as they form. That water is part of the solid, not a sign of dampness, and the prefix tells you how much: mono means one water molecule for each molecule of the compound. The name matters because the water adds weight.1,3

Creatine monohydrate

Creatine crystallizes from water as prisms holding one molecule of water per molecule of creatine. Heating to around 100 degrees Celsius drives that water off and leaves anhydrous creatine. Because of the water, 100 g of creatine monohydrate holds about 88 g of creatine.1,2

Creatine content of some forms, from a 2011 review1
FormCreatine by weight
Creatine anhydrous100%
Creatine monohydrate87.9%
Creatine citrate (3:1)66%
Creatine pyruvate60%

The amounts NIH describes from studies, such as 3 to 5 g a day after an optional loading phase of 20 g a day, refer to creatine monohydrate powder.2

Other forms of creatine

Creatine is also sold as salts and esters, such as creatine citrate, pyruvate and ethyl ester. A 2022 critical review concluded that creatine monohydrate remains the only source with substantial evidence for bioavailability and safety. Its authors disclose ties to creatine makers.2,4

Questions people ask

Is creatine monohydrate the same as creatine?

It is creatine with one molecule of water for each molecule of creatine in the crystal. By weight it is about 88% creatine, so 5 g of the powder provides about 4.4 g of creatine.1,2

Is monohydrate better than anhydrous creatine?

Anhydrous creatine has the water removed, so it is 100% creatine by weight against 87.9% for the monohydrate, and slightly less powder gives the same creatine. Most research used the monohydrate.1,2

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Sources

  1. Jäger R, Purpura M, Shao A, Inoue T, Kreider RB. Analysis of the efficacy, safety, and regulatory status of novel forms of creatine. Amino Acids. 2011;40(5):1369-1383. Opened 2026-10-07.
  2. Office of Dietary Supplements, National Institutes of Health. Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health Professionals. Updated April 1, 2024. Opened 2026-10-07.
  3. PubChem, National Center for Biotechnology Information. Creatine Monohydrate, CID 80116. Opened 2026-10-07.
  4. Kreider RB, Jäger R, Purpura M. Bioavailability, Efficacy, Safety, and Regulatory Status of Creatine and Related Compounds: A Critical Review. Nutrients. 2022;14(5):1035. Opened 2026-10-07.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.