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December 2017 in “International Journal of Dermatology” People with alopecia areata often have lower vitamin D levels, which are linked to more severe and longer-lasting hair loss, but vitamin D receptor levels in the skin don't show the same pattern and don't predict treatment success.
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December 2016 in “Egyptian Journal of Basic and Applied Sciences” Alopecia areata patients have lower vitamin D levels than healthy individuals.
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October 2024 in “Journal of the American Academy of Dermatology” Continued ritlecitinib treatment helps sustain hair regrowth in alopecia areata patients.