The Study
Effects of 28 days of beta-alanine and creatine supplementation on muscle carnosine, body composition and exercise performance in recreationally active females
This study gave different supplements to women and saw what happened, but it didn't have enough people to be super sure if the supplements really made a difference. It's like testing if a new snack gives you more energy—you might feel it, but if only a few people tried it, you can't say for sure it works for everyone.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Scientists gave women pills with beta-alanine, creatine, both, or nothing to see if they could run or sprint better after 4 weeks.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 569 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Even without big changes in muscle chemicals, beta-alanine helped women recover faster between sprints — meaning they could push harder longer during short bursts of exercise.
- 2Beta-alanine made women less tired during repeated sprints and lowered their blood lactate, even though their muscle carnosine didn't go up much.
- 3Creatine didn't reliably increase muscle creatine.
- 4Combining them didn't help more than either alone.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of the International Society of Sports Nutrition
Year
2012
Authors
Julie Y. Kresta, J. Oliver, A. Jagim, J. Fluckey, S. Riechman, Katherine A. Kelly, C. Meininger, S. Mertens-Talcott, C. Rasmussen, R. Kreider
Related Content
Claims (10)
Taking beta-alanine supplements does not change the maximum power output during short bursts of activity in female athletes.
In recreationally active women, taking beta-alanine for four weeks reduces how quickly fatigue builds up during repeated all-out cycling sprints, with a large effect size, even though muscle carnosine levels do not change significantly.
Taking 6.1 grams of beta-alanine daily for four weeks leads to an average 35-42% increase in muscle carnosine levels in recreationally active women, but the change is not statistically significant because of individual differences and a small number of participants.
In recreationally active women, taking creatine monohydrate at a specific dose for four weeks increases muscle creatine levels by 6–14% after the first week, but this increase does not remain after continuing the lower dose, and the change is not statistically significant because of high individual variation and a small number of participants.
In recreationally active women, taking 6.1 grams of beta-alanine daily for four weeks leads to an average 35-42% increase in muscle carnosine levels, but the change is not statistically significant because of individual differences and a small number of participants.
In recreationally active women, taking beta-alanine for four weeks reduces how quickly fatigue builds up during repeated all-out cycling sprints, with a large effect size, and this improvement is linked to better muscle acid buffering even though muscle carnosine levels do not change significantly.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.