Supplementation with creatine is widely recognized in the sports world for its ability to enhance muscle mass and athletic performance. However, not all athletes respond to creatine in the same way, and this variability is increasingly attributed to genetic factors. This study sheds light on how certain genetic polymorphisms can predict an individual’s response to creatine supplementation, which offers valuable insights for tailoring supplementation strategies for professional athletes.

For athletes with a favorable genetic profile, creatine supplementation is likely to result in significant muscle mass gains and reduced injury risk. These individuals can follow standard dosing protocols with confidence in their likely positive response. In contrast, the implications are more nuanced for athletes with a less favorable genetic profile. Although they may still benefit from creatine, muscle mass gains may be less pronounced. These athletes might need to adjust their expectations or consider higher doses under professional guidance. The key advantage of knowing one’s genetic profile lies in the ability to make informed decisions about supplementation strategies, rather than following a one-size-fits-all approach.

For the average person, the practical implications of this study are limited, but there are still important takeaways. Recognizing that genetic factors might influence how well creatine works can help set realistic expectations for muscle gains and performance. As such, a slower pace of progress might encourage a more patient, sustainable approach to creatine supplementation. Ultimately, regardless of genetic factors, focusing on balanced nutrition, consistent training, and proper recovery remains key to achieving fitness goals.

Although genetics play a crucial role in determining individual responses to creatine supplementation, a variety of other factors significantly influence creatine’s effectiveness in promoting muscle mass gains. Research has shown that factors such as age, sex, and exercise type can influence the outcomes of creatine supplementation and often determine the extent of its benefits.

Age is a key factor, but contrary to what might be expected, younger and older adults generally experience similar muscle gain potential from creatine supplementation when it is combined with resistance training. The evidence indicates that both age groups can benefit from creatine, with no significant differences in muscle gain, especially when combined with resistance training.^[1] However, the effects of creatine supplementation may be reduced in older adults, when factors such as sarcopenia and lower muscle mass contribute to reduced responses.^[2]

Research has also found that sex plays a crucial role in how effectively creatine increases muscle mass. A meta-analysis of randomized controlled trials from 2022^[1] found that men responded more favorably to creatine supplementation than women, particularly when it is combined with resistance training. As such, men supplementing creatine showed an average increase in lean body mass of approximately 3.3 pounds (1.5 kg), whereas women experienced an increase of only approximately 0.7 pounds (0.3 kg), and this effect in women wasn’t statistically significant. This disparity might be attributed to physiological differences, such as higher concentrations of intramuscular creatine stores in women, which is a possible byproduct of hormonal differences.^[3] So, it’s important to note that this study focused only on men, so it’s unclear how genetic factors might affect creatine’s benefits in women.

Finally, the type of exercise performed alongside creatine supplementation is critical. Resistance training consistently proves to be the most effective exercise for maximizing creatine’s muscle-building effects.^[1] In contrast, combining creatine with mixed or aerobic exercises typically does not lead to significant muscle mass increases.^[1] Given that this study incorporated a mix of strength, endurance, and skill-based exercises, it’s possible that a more resistance-focused routine might have yielded different results.

Predictors of creatine supplementation responsiveness

In this context, responsiveness is based on changes in muscular creatine stores and/or muscle mass and strength, but not necessarily the neurological effects of creatine.

Conclusion

Overall, this study underscores the importance of considering both genetic and nongenetic factors when optimizing creatine supplementation for muscle mass and performance gains. Although genetics can guide a more personalized approach, other variables such as age, sex, and exercise type should also inform supplementation strategies and manage expectations about creatine’s potential benefits accordingly. For professional athletes, this research offers a pathway to more effective and individualized use of creatine. For the broader population, it reinforces the value of setting realistic expectations and emphasizes the need for a well-rounded approach to fitness and supplementation.

Are the benefits of creatine influenced by genetics? Original paper