A chemical that looks like creatine can block muscle cells from taking in creatine — in rat muscle tests, it stopped 82% of the creatine from getting in when used at a certain strength, which means it might be pretending to be creatine to get in first.

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Pro

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Evidence from Studies

Supporting (1)

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Community contributions welcome

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Creatine uptake in isolated soleus muscle: kinetics and dependence on sodium, but not on insulin.

Cohort Study

Animal

1999 Jun

The study found that a creatine-like molecule called β-guanidinopropionic acid blocks 82% of creatine from entering rat muscle cells — just like the claim says. This suggests it’s competing for the same entry point, which is exactly what the claim claims.

Contradicting (0)

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Community contributions welcome

No contradicting evidence found

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.

Source Study

Creatine uptake in isolated soleus muscle: kinetics and dependence on sodium, but not on insulin.

Score: 12

DOI: 10.1046/J.1365-201X.1999.00539.X

Similar Assertions

When scientists lowered the sodium levels around rat muscle cells, the cells absorbed much less creatine—showing that sodium is needed for creatine to get inside these muscle cells.

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79%

Your muscles use a special door called SLC6A8 to let creatine in, and this door only works when there’s more sodium outside the cell than inside — like a pump that needs salt to open.

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73%