Genetics Hint Vitamin D Helps Muscle Mass, But Not Grip Strength
Graded Moderate — mendelian randomization using pooled genetic data from European-ancestry studies, though results rest on genetic proxies rather than direct trials in people.
This study suggests vitamin D may support muscle mass, but don't expect stronger grip.
Researchers used gene variants tied to lifelong vitamin D levels to test cause and effect, which sidesteps the usual confounders. Higher vitamin D was linked to slightly more muscle mass in the arms and legs in people of European ancestry. But there was no sign it affected grip strength or walking speed, the other main markers of sarcopenia. So vitamin D may support muscle size without translating into measurable strength.
Disclaimer: Research summaries are provided for informational purposes only and do not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.
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