A new study by researchers from Trinity College Dublin and St James's Hospital has reported for the first time that vitamin D can be measured in human hair. The paper has been published in the international, peer-reviewed journal of human nutrition, Nutrients.
At present, the best way of assessing vitamin D is to measure the concentration of vitamin D in the blood. However, this can be painful, requires expertise and training along with hygienic conditions/equipment so getting a sample is not always workable. In addition, the blood result represents vitamin D status at a single time point, which is problematic because vitamin D changes with the seasons: it's not uncommon for someone to be sufficient in vitamin D in the summer time, and very deficient in the winter. This means that a single snapshot of vitamin D status is not able to provide information on vitamin D year-round.
The current study is the first in the world to publish that it is possible to extract and measure vitamin D in human hair. This is a major step forward in assessing vitamin D status, potentially one of the major innovations in vitamin D measurement. Traditional blood analysis captures just a moment in time; in contrast, hair, which grows at approximately 1cm per month, could reflect vitamin D status over several months capturing the large seasonal differences in vitamin D status.
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