Barely Significant
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The Effect of CYP1A2 Gene Polymorphisms on Caffeine Pharmacokinetics and Exercise Performance in Male Recreational Athletes.

Eur J Sport Sci · 2026 · PMC13239719 · PMID 42230302

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may be significantno p-value reported
Future studies should include CC allele carriers, as differences in ergogenic effects of caffeine between AC and CC allele carriers may be significant enough to differentiate performance outcomes.

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