It's important to take note of these units. Some countries like the United States use ng/mL as their base measure and other countries (such as Canada) use mol/L. It's important to maintain 25 hydroxy-vitamin D levels above 30 ng/mL which translates to 75 mol/L. To monitor vitamin D levels, we don't actually measure vitamin D, we measure 25 hydroxy-vitamin D (sometimes simply referred to as 25 OH D). Nevertheless, having low vitamin D levels could impair hair function, at least theoretically.
This remains controversial from the perspective of hair loss because simply taking vitamin D tablets is not going to promote hair growth for most.
Given that there may be some role between hair growth and vitamin D signaling inside cells, the current view is to ensure that vitamin D levels are adequate.
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