The Study
Effects of vitamin D on primary human skeletal muscle cell proliferation, differentiation, protein synthesis and bioenergetics.
This study looked at muscle cells in a dish, not in people, and saw that vitamin D changed how they grew and worked. But that doesn’t mean taking vitamin D pills will make your muscles stronger or healthier — it’s just a first step in the lab.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Scientists gave muscle cells a form of vitamin D and saw that it slowed down their growth, helped them turn into mature muscle cells, made them better at building protein when insulin was around, and made them use more oxygen for energy.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 53 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1These are lab results in isolated human muscle cells — not yet proven to affect human muscle strength or health directly.
- 2100 nM vitamin D: slowed muscle cell growth, improved protein building with insulin, increased oxygen use after 24 hours in young cells and 5 days in mature cells.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The Journal of steroid biochemistry and molecular biology
Year
2019
Authors
Karina Romeu Montenegro, Rodrigo Maron Carlessi, Vinicius Fernandes Cruzat, P. Newsholme
Related Content
Claims (5)
If you have more vitamin D in your body, your body burns more calories while you're just sitting still—even if you don’t move more or eat differently.
A form of vitamin D that your body uses helps muscle cells grow better, improves how muscles use insulin to build protein, and makes the energy factories inside muscle cells work harder.
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.
When muscle cells from humans are treated with a specific form of vitamin D for five days, they become more active in building proteins — especially when insulin is also around.
When you give human muscle cells a specific form of vitamin D, they start using more oxygen — but only after 24 hours if they’re young cells, and after 5 days if they’ve turned into mature muscle fibers.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.