Can vitamin D pills make your muscles stronger?
Effects of 1,25-Dihydroxyvitamin D3 and Vitamin D3 on the Expression of the Vitamin D Receptor in Human Skeletal Muscle Cells
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Baseline blood vitamin D levels didn’t correlate with VDR mRNA in muscle—only with VDR protein.
Everyone assumed higher blood vitamin D = more VDR gene activity. But the study found no link at baseline—meaning gene expression isn’t driven by current levels, only by sustained supplementation.
Practical Takeaways
If you're over 65 and have low vitamin D (<30 ng/mL), taking 4,000 IU/day for 4+ months may help your muscles become more responsive to vitamin D.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Baseline blood vitamin D levels didn’t correlate with VDR mRNA in muscle—only with VDR protein.
Everyone assumed higher blood vitamin D = more VDR gene activity. But the study found no link at baseline—meaning gene expression isn’t driven by current levels, only by sustained supplementation.
Practical Takeaways
If you're over 65 and have low vitamin D (<30 ng/mL), taking 4,000 IU/day for 4+ months may help your muscles become more responsive to vitamin D.
Publication
Journal
Calcified Tissue International
Year
2014
Authors
Rachele Pojednic, L. Ceglia, K. Olsson, T. Gustafsson, A. Lichtenstein, B. Dawson-Hughes, R. Fielding
Related Content
Claims (6)
Taking a daily vitamin D3 pill (4000 IU) for four months can help older adults with low vitamin D levels build stronger muscle fibers by increasing the number of vitamin D receptors inside their muscle cells.
In older adults who have trouble moving around, higher levels of vitamin D in the blood are linked to more vitamin D receptors in their muscles — meaning the more vitamin D they have, the more of these muscle sensors they seem to have.
In older women who have trouble moving and low vitamin D, taking a daily vitamin D supplement for 4 months might help their muscles make more of a key protein that helps vitamin D work, while those who take a fake pill might see that protein drop instead.
When scientists gave a specific form of vitamin D to muscle cells from young, healthy people for 18 hours, they noticed the cells made 36% more of a protein that helps vitamin D work — suggesting vitamin D might tell these cells to make more of this protein themselves.
In older people, having more or less vitamin D in the blood doesn’t seem to change how much of the vitamin D receptor gene is active in their muscles — the two just don’t go up or down together.