Creatine but not betaine supplementation increases muscle phosphorylcreatine content and strength performance. – Cost Effective Supplements

Creatine but not betaine supplementation increases muscle phosphorylcreatine content and strength performance.

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Link to full study

http://www.ncbi.nlm.nih.gov/pubmed/21744011

Conclusion of this study

In conclusion, we reported that betaine supplementation does not augment muscle PCr content. Furthermore, we showed that betaine supplementation combined or not with creatine supplementation does not affect strength and power performance in untrained subjects.