The Claim
In rat L6 myoblasts, knockdown of the vitamin D receptor (VDR) reduces Myh2 gene expression under vehicle conditions by 43%, and this reduction is reversed by treatment with 1,25-dihydroxyvitamin D3.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When scientists lower a specific vitamin D sensor in rat muscle cells, the cells make less of a protein linked to fast-twitch muscles—but giving them a form of vitamin D brings that protein back up.
See the scientific wording
In rat L6 myoblasts, knockdown of the vitamin D receptor (VDR) reduces Myh2 gene expression (fast-twitch fiber marker) by 43% under vehicle conditions, but this reduction is reversed by treatment with 1,25-dihydroxyvitamin D3.
What the research says
1 studyStudy: 1,25‐Dihydroxyvitamin D3 Mediates L6 Myoblast Differentiation via Vitamin D Receptor (VDR)
Scientists turned down the vitamin D receptor in rat muscle cells, which made a fast-twitch muscle gene (Myh2) weaker — but when they added active vitamin D, the gene bounced back to normal. So yes, vitamin D fixes the problem caused by turning off its receptor.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.