Creatine Interactions

Early studies suggested caffeine blunts the ergogenic effect of creatine on muscle phosphocreatine resynthesis and high-intensity performance, but subsequent randomized trials show the combination is generally additive or neutral; the original blunting effect appears specific to chronic co-ingestion during creatine loading rather than acute pre-workout use.

Co-ingesting creatine with carbohydrate spikes insulin, which upregulates the sodium-dependent creatine transporter and Na+/K+ pump activity in skeletal muscle, increasing intramuscular creatine retention.

Creatine boosts phosphocreatine stores for ATP regeneration during short maximal efforts, while beta-alanine raises muscle carnosine to buffer the H+ accumulation that limits efforts lasting tens of seconds to a few minutes. The two address different limiters of high-intensity performance.