Vitamin D and neurological disorders [https://en.wikipedia.org/wiki/Vitamin\_D\_and\_neurology](https://en.wikipedia.org/wiki/Vitamin_D_and_neurology) Vitamin D may help improve speech problems in autistic children [https://www.mediplacements.com/article-801828900-vitamin\_d\_may\_help\_improve.html](https://www.mediplacements.com/article-801828900-vitamin_d_may_help_improve.html) Vitamin D deficiency linked to speech problems [https://www.abc.net.au/news/2012-02-14/lack-of-vitamin-d-linked-to-speech-problems/3830212](https://www.abc.net.au/news/2012-02-14/lack-of-vitamin-d-linked-to-speech-problems/3830212)