Creatine: What It Does, What It Doesn't Do, and How to Take It
Exercise professional · creator of the Letz method
Short answer
Creatine monohydrate is the supplement with the strongest scientific support for performance in high-intensity, short-duration efforts, showing a consistent effect on strength and lean mass when combined with training. Timing is not a decisive variable; what matters is consistent, continued supplementation over time.
What the evidence supports
Among supplements sold for performance, creatine monohydrate has the most solid and thoroughly replicated evidence base. Its effect appears in high-intensity, short-duration efforts and translates into more total work performed across a training program—which is the mechanism through which it contributes to strength and lean mass.
It is important to understand that it does not build muscle on its own. It allows you to train slightly more, and that additional training is what produces the results over time.
Dosage and timing
Scientific consensus considers continued supplementation to be what matters. Initial loading protocols shorten the time it takes to see an effect, but they do not change the ultimate outcome compared to a steady daily dose.
Timing relative to your workout is not a decisive variable. Consistency across weeks is.
What does not hold up
The association between creatine and kidney damage in healthy individuals finds no support in peer-reviewed literature. Anyone with kidney disease or any relevant health condition should discuss the matter with their physician—as with any supplement.
Initial weight gain is real and consists primarily of intracellular water. It is not fat, and it is not an illusion: it is part of the mechanism.
Frequently asked questions
Do you need to do a loading phase?
It is not necessary. Loading shortens the time it takes to see results, but a consistent daily dose reaches the same point within a few weeks.
Is creatine harmful to the kidneys?
In healthy individuals, the peer-reviewed literature does not support this association. Anyone with kidney disease or another relevant condition should discuss the matter with their physician.
Do you have to take creatine every day, including rest days?
What the evidence supports is continued supplementation, not specific timing or whether it coincides with a training day.
Registry rules cited here
- Creatine monohydrateCreatine monohydrate is the supplement with the strongest evidence for improving performance in high-intensity efforts and supporting lean mass gains with training, with a favorable safety profile.
- Protein and Training AdaptationSufficient protein can support gains in lean mass and strength alongside training; the response varies and does not increase indefinitely with higher intakes.
- Resistance Training, Strength, and HypertrophyVarious training prescriptions improve strength and hypertrophy; heavier loads favor strength, and multiple sets favor hypertrophy.
Sources cited
- Kreider et al., Journal of the International Society of Sports Nutrition, 2017 DOI 10.1186/s12970-017-0173-z
- Morton et al., British Journal of Sports Medicine, 2018 DOI 10.1136/bjsports-2017-097608
- Jäger et al., Journal of the International Society of Sports Nutrition, 2017 DOI 10.1186/s12970-017-0177-8
- Currier et al., British Journal of Sports Medicine, 2023 DOI 10.1136/bjsports-2023-106807
Informational content about training and nutrition. It is not a recommendation, prescription or adjustment of any medication, and it does not replace assessment by your doctor or dietitian.