The Claim

Ablation of the vitamin D receptor in mice is associated with significantly reduced grip strength, smaller muscle fiber size, and increased myostatin expression in the quadriceps muscle, indicating that intact vitamin D signaling is necessary for normal regulation of muscle strength and mass.

Source: Vitamin D Receptor Ablation and Vitamin D Deficiency Result in Reduced Grip Strength, Altered Muscle Fibers, and Increased Myostatin in Mice

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
13score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

How it works
1 study reviewed
In plain English

When mice can't use vitamin D properly, their muscles get weaker, their muscle fibers shrink, and a protein that stops muscle growth increases—so vitamin D seems to help keep muscles strong and healthy.

See the scientific wording

Vitamin D receptor ablation in mice is associated with significantly reduced grip strength, smaller muscle fiber size, and increased myostatin expression in quadriceps muscle, suggesting that intact vitamin D signaling is necessary for normal muscle strength and mass regulation.

What the research says

1 study

  1. Study: Vitamin D Receptor Ablation and Vitamin D Deficiency Result in Reduced Grip Strength, Altered Muscle Fibers, and Increased Myostatin in Mice

    Scientists removed the vitamin D receptor in mice and found their muscles got weaker, smaller, and produced more of a protein that stops muscle growth — exactly what the claim says.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

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