Does creatine break a fast?

Q: Does creatine break a fast?

Maybe - use caution. Plain creatine is usually okay by calories. Pure creatine is not a protein shake or BCAA; the fasting risk usually comes from what it is mixed with. Use plain, third-party-tested creatine with water, or take it in the eating window if your stomach feels off.

/ 100

Use caution

Plain creatine is usually okay by calories

0-10 kcal

Maybe - use cautionmedium confidenceSupplement-label evidence

Decision

Maybe - use caution. Plain creatine monohydrate has little to no usable calories, but flavored mixes can contain sugar or other ingredients.

Reason

Pure creatine is not a protein shake or BCAA; the fasting risk usually comes from what it is mixed with.

Evidence

NIH supplement guidance treats creatine as a common performance supplement ingredient; product quality and added ingredients vary by label.

How we calculate this value

Base tier: 60/100 for "Use caution". Item adjustment: +22 points for calories, nutrient signal, product variability, and safety caution. Final Fast Score: 82/100.

What to do

Use plain, third-party-tested creatine with water, or take it in the eating window if your stomach feels off.

Medical caution

Ask a clinician before using creatine if you have kidney disease, are pregnant, or take medication that affects kidney function.

References for this answer

Methodology

NIH Office of Dietary Supplements: Dietary Supplements for Exercise and Athletic Performance NIH Office of Dietary Supplements: Dietary Supplement Fact Sheets U.S. Food and Drug Administration: Dietary Supplements MedlinePlus, National Library of Medicine: Taking multiple medicines safely