Creatine in CrossFit: what does the science really say?
Creatine is perhaps the most talked about supplement within CrossFit. But among all the Instagram advice, pre-workout hype and marketing claims, one thing is often forgotten: What does the science actually say?
In this blog, I’ll take you through what creatine really does, who it’s useful for, how to use it correctly and where the limits are. No fitness myths, no bro-science, but based on recent systematic reviews and controlled studies.
“Explosive power.”
“Repeated maximum effort.”
“Rapid recovery between sets.”
”High training volume.
What is creatine anyway?
Creatine is an endogenous substance built from three amino acids: arginine, glycine and methionine. Your liver and kidneys make it themselves, and in addition you get it through meat and fish.
In your muscles, creatine is converted into creatine phosphate. That system supports rapid ATP production during short, explosive efforts. Exactly the energy system that is dominant in heavy elevators, sprints and short high-intensity WODs.
The comprehensive position stand of the International Society of Sports Nutrition describes this mechanism in detail and confirms that creatine is one of the best researched ergogenic supplements.
Why is creatine interesting in CrossFit?
CrossFit requires:
- Explosive power
- Repeated maximum efforts
- Fast recovery between sets
- High training volume
Creatine supplementation increases the availability of phosphocreatine in the muscle, allowing you to deliver just a little more power or do just one more repetition. A recent review on creatine and performance enhancement shows that creatine consistently improves performance during resistance training and repeated maximal efforts.
Specifically, for CrossFit athletes, this means: more training quality → more adaptation → more progression.
Creatine and muscle mass: what does research show?
Creatine itself does not build muscle. Training does. But creatine enhances the training response.
Research on creatine combined with strength training shows that participants develop more lean mass and greater strength gains than when training without creatine.
Important detail: the first pounds of weight gain in Week 1 are largely intracellular fluid in the muscle. This is neither “fat” nor subcutaneous fluid. Longer term, the gains come primarily from increased training volume and intensity.
Does creatine work without training?
Short answer: hardly at all. Most of the positive effects on muscle mass and strength have been demonstrated in combination with resistance training. Without training stimulus, the added value is limited. The ISSN position stand also clearly emphasizes this: creatine is a performance enhancer, not a substitute for training.
Within CrossFit that means: train first, then optimize.
What is the proper dosage in CrossFit?
Most literature supports: 3 to 5 grams per day as a maintenance dosage. A more accurate alternative is 0.1 grams per kilogram of body weight per day. For an 80-kg athlete, that works out to about 8 grams per day.
Higher maintenance doses provide no additional benefit in strength gains, but do increase the risk of gastrointestinal complaints. A loading phase is not necessary if you supplement consistently for long periods of time.
Creatine and women
Creatine is not just for men. Recent literature shows that women experience similar benefits in strength and lean mass. There is no evidence that women face different or greater risks at normal doses.
So within CrossFit, creatine is just as relevant to female athletes.
Who does creatine make sense for within CrossFit?
Fancy for:
- Athletes who train several times a week
- Athletes who want to maximize progression
- Vegetarians or vegans with lower baseline creatine levels
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Athletes who focus on strength, power and repeated intensity
Less useful for:
- People who do not train
- People looking for a panacea
- People with existing kidney problems without medical supervision
Critical note about supplements
The supplement market runs largely on marketing. Creatine is one of the few supplements whose effectiveness has been repeatedly researched and confirmed in multiple systematic reviews and controlled studies.
But even then, the basics remain:
- Training
- Sleep
- Nutrition
- Progressive overload
Creatine reinforces a good program. It does not compensate for a bad program.
Our vision within the box
We do not recommend supplements because they are popular.
We recommend them when:
- They are scientifically based
- They fit your training goals
Creatine can be a valuable addition within CrossFit, provided the basics are right.
Unsure if it makes sense for you? Want to know what dosage fits your training volume?
Request nutritional guidance. Our coaches are trained to critically and scientifically evaluate supplements.
Source
Kreider RB et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. JISSN. 2021.
Jagim AR et al. Creatine supplementation and exercise performance: updated evidence. 2022.
Forbes SC et al. Creatine supplementation and muscle adaptations to resistance training. 2022.
van der Merwe J et al. Effects of creatine supplementation on DHT levels. 2009.
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