The Claim

Both ablation of the vitamin D receptor and dietary vitamin D deficiency in mice are associated with downregulation of genes encoding calcium-handling proteins, including Serca channels, suggesting that impaired calcium regulation may contribute to reduced muscle strength.

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 don’t have enough vitamin D or can’t use it properly, their muscles weaken because the genes that help move calcium around in muscle cells don’t work as well.

See the scientific wording

Both vitamin D receptor ablation and dietary vitamin D deficiency in mice are associated with downregulation of genes encoding calcium-handling proteins, including Serca channels, suggesting impaired calcium regulation may contribute to reduced muscle strength.

What the research says

1 study

Study: Vitamin D Receptor Ablation and Vitamin D Deficiency Result in Reduced Grip Strength, Altered Muscle Fibers, and Increased Myostatin in Mice
The study showed that when mice can’t use vitamin D or don’t get enough of it, their muscles get weaker and the proteins that help move calcium in muscle cells don’t work as well — which explains why they can’t grip as strongly.

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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