The Claim
In Wistar rats, experimental overexpression of the vitamin D receptor (VDR) in the tibialis anterior muscle for 10 days is associated with a 17% increase in myofiber cross-sectional area, elevated muscle protein synthesis rates (17.3% vs. 10.2% D2O enrichment), and enhanced activation of mTOR signaling, suggesting that VDR upregulation supports muscle hypertrophy through anabolic pathways.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
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 turned up the vitamin D receptor in the leg muscles of rats for 10 days, the muscle fibers got bigger, the muscles made more protein, and key growth signals kicked in—so it looks like boosting this receptor might help muscles grow.
See the scientific wording
In Wistar rats, experimental overexpression of the vitamin D receptor (VDR) in the tibialis anterior muscle for 10 days is associated with a 17% increase in myofiber cross-sectional area, along with elevated muscle protein synthesis rates (17.3% vs. 10.2% D2O enrichment) and enhanced activation of mTOR signaling, suggesting VDR upregulation supports muscle hypertrophy through anabolic pathways.
What the research says
1 studyStudy: Overexpression of the vitamin D receptor (VDR) induces skeletal muscle hypertrophy
Scientists made rats produce more of a protein called VDR in their leg muscles, and those muscles got bigger and built more protein, just like the claim said they would.
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.