The Study
Causal relationship between vitamin D and adult height: A bidirectional Mendelian randomization study
This study used people’s genes like a natural experiment to guess if having more vitamin D makes you taller. It found a tiny link — like if you had a little more vitamin D, you might be a tiny bit taller — but it didn’t prove vitamin D causes taller height. It’s like guessing the weather by looking at clouds, not by turning on the sun.
Analysis score
Maximum 0 for a computational/algorithm study.
Where the score came from
Scientists used your genes to see if having more vitamin D as you grow makes you taller as an adult, and if being tall makes your body make more vitamin D.
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 50 / 100
Quality score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The effect is tiny — like growing 0.4 cm taller for every 10 ng/mL increase in vitamin D — so it won’t make a noticeable difference in how tall someone ends up.
- 2Every time vitamin D levels go up by one standard deviation, height goes up by 0.046 standard deviations.
- 3Being tall doesn’t change vitamin D levels.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Medicine
Year
2025
Authors
Lianhui Chen, Min Wu, Zhenzhong Zeng, Xiaohao Hu, Yongfen Wang
Related Content
Claims (10)
People who naturally have more vitamin D in their blood tend to be taller as adults, and this link comes from our genes—not because vitamin D makes you grow taller, but because the same genes that affect vitamin D also affect how tall you get.
Scientists use your genes to guess how much vitamin D you’ve had over your life, and since these genes don’t change much as you grow, they can help estimate your vitamin D levels even when you were a kid—even though the data was collected from adults.
People who naturally have more vitamin D in their blood tend to be a tiny bit taller as adults—like a small nudge in height—because their bodies have had more vitamin D throughout life.
Being taller doesn’t cause your body to have more or less vitamin D—any link you see between height and vitamin D is probably because taller people spend more time outside or have bigger bodies, not because height directly affects vitamin D.
People who naturally have more vitamin D in their blood tend to be a tiny bit taller as adults—like a small nudge in height—not much, but it’s a real pattern scientists noticed.
If you already have enough vitamin D, taking more won’t make you significantly taller — the tiny boost you might see is too small to matter in real life.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.