When insulin is present, it tells muscle cells to pump more sodium and potassium around, which creates a better environment for the cell to pull in more creatine — a compound that helps muscles store energy.
Evidence from Studies
Supporting (2)
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Role of Serine/Threonine Protein Phosphatases in Insulin Regulation of Na+/K+-ATPase Activity in Cultured Rat Skeletal Muscle Cells*
Insulin tells muscle cells to turn on a pump that moves sodium and potassium, which creates an electrical charge that helps another pump bring creatine into the cell — and this study proved insulin does exactly that.
Regulatory effect of insulin on the structure, function and metabolism of Na+/K+-ATPase (Review)
This study shows that insulin makes a cellular pump (Na⁺/K⁺-ATPase) work better, which helps create a sodium imbalance across muscle cell walls — and that’s exactly what’s needed to pull more creatine into the cell. So yes, insulin helps with creatine transport, indirectly.
Contradicting (2)
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Effects of Electrical Stimulation and Insulin on Na+–K+‐ATPase ([3H]Ouabain Binding) in Rat Skeletal Muscle
The study found that insulin makes muscle cells pump out more sodium, but it doesn’t do this by adding more pumps to the cell membrane — which is what the claim says. So the claim is wrong about how insulin works.
Creatine uptake in isolated soleus muscle: kinetics and dependence on sodium, but not on insulin.
The study checked if insulin helps muscle cells take in more creatine, and found it doesn’t — even though creatine uptake still needs sodium. So the claim that insulin boosts creatine transport is wrong.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.