The Claim

In primary human skeletal muscle myoblast cells, treatment with 100 nM of active vitamin D (1,25(OH)2D) for 24 to 72 hours inhibits cell proliferation and enhances differentiation by altering the expression of myogenic regulatory factors.

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

What the research says

Roughly balanced

Support and challenge are close. The picture may shift as more studies come in.

Supports
3score
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 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.

See the scientific wording

In primary human skeletal muscle myoblast cells, treatment with 100 nM of active vitamin D (1,25(OH)2D) for 24 to 72 hours inhibits cell proliferation and enhances differentiation by altering the expression of myogenic regulatory factors.

What the research says

1 study

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

    Scientists gave human muscle cells a form of vitamin D and found that it slowed down their growth and helped them turn into mature muscle fibers, just like the claim said.

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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