4 citations
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May 2021 in “Molecules” The hair test for vitamin D could be a useful alternative to blood tests, providing a longer-term vitamin D status, but more research is needed.
January 2025 in “Scientific Reports” Hair analysis can show changes in vitamin D levels over time.
July 2025 in “JAAD Case Reports” 3 citations
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January 2015 in “Journal of the Egyptian Womenʼs Dermatologic Society”
2 citations
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May 2022 in “Diagnostics” Vitamin D levels in hair don't match those in blood, so hair isn't a reliable indicator of Vitamin D status.