Vitamin D Only Seems to Slow Aging Markers If You Were Low to Begin With
Graded Moderate — narrative review drawing on human trials alongside animal and cell work, yet with no systematic search or pooled analysis of its own.
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- N/A (narrative review)
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This review suggests a blood test for vitamin D levels is more useful than guessing at a dose.
Vitamin D talks directly to your genes, switching them on and off in ways that overlap with how aging works. But this review of the evidence found that big trials of vitamin D pills alone show little benefit for healthy aging. The clearest effects showed up in people who were actually deficient, and when supplements were paired with exercise and better nutrition. The authors also point to a J-shaped curve, meaning too much can be as unhelpful as too little.
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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