Scientists found that rat leg muscle cells absorb creatine at a specific speed and capacity—like a sponge that can only soak up so much water before it’s full.

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Pro

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Against

Evidence from Studies

Supporting (1)

12

Community contributions welcome

12

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

Cohort Study

Animal

1999 Jun

The study measured how fast rat leg muscle takes up creatine and found the exact numbers mentioned in the claim—73 μM and 77 nmol/h/g—proving the muscle’s creatine uptake works like a saturated pump, just as the claim says.

Contradicting (0)

0

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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

The soleus muscle, which is used for standing and walking, is better at grabbing creatine from the blood when there’s not much of it around than the fast-twitch muscles in your leg, like the extensor digitorum longus.

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79%

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%