Analysis Version
v1
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mechanistic
Analysis v1
Strong Support

A form of vitamin D that your body uses helps muscle cells grow better, improves how muscles use insulin to build protein, and makes the energy factories inside muscle cells work harder.

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Pro
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Against

Evidence from Studies

Supporting (3)

14

Community contributions welcome

9

1,25(OH)2-vitamin D3 enhances the stimulating effect of leucine and insulin on protein synthesis rate through Akt/PKB and mTOR mediated pathways in murine C2C12 skeletal myotubes.

Cross-Sectional Study
Animal
2013 Dec

The study found that the active form of vitamin D helps muscle cells build more protein when insulin and leucine are present, which matches part of the claim. Even though it was done in mouse cells, not human ones, the mechanism is very similar.

6

1,25‐Dihydroxyvitamin D3 Mediates L6 Myoblast Differentiation via Vitamin D Receptor (VDR)

Cross-Sectional Study
In Vitro

This study found that the active form of vitamin D helps muscle precursor cells in rats mature into muscle cells, which supports part of the claim — but it didn’t test how vitamin D affects protein building or energy production in human muscle cells.

3

Effects of vitamin D on primary human skeletal muscle cell proliferation, differentiation, protein synthesis and bioenergetics.

Cross-Sectional Study
In Vitro
2019 Oct

The study gave human muscle cells the active form of vitamin D and found that it helped them grow into mature muscle cells better, made them more responsive to insulin for building protein, and improved their energy production — exactly what the claim says.

Contradicting (0)

0

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.

Similar Assertions

When muscle cells from humans are treated with a specific form of vitamin D for five days, they become more active in building proteins — especially when insulin is also around.

3
0
80%

When you give a special form of vitamin D to muscle cells in a lab dish for a day or three, it slows down how fast they multiply and helps them turn into mature muscle cells by changing which genes they use.

3
0
79%

When scientists gave a specific form of vitamin D to muscle cells from young, healthy people for 18 hours, they noticed the cells made 36% more of a protein that helps vitamin D work — suggesting vitamin D might tell these cells to make more of this protein themselves.

54
0
77%

When scientists add a form of vitamin D to human muscle cells in a lab, the cells start making a lot more of a specific molecule—like turning up a volume knob—showing that these muscle cells can respond to vitamin D.

0
54
77%

In lab-grown rat muscle cells, a form of vitamin D helps change how the cells develop into muscle fibers, but only partly — another protein called the vitamin D receptor is involved, and it’s probably not the only one doing the job.

6
0
76%

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