How B12 deficiency has demonstrated to be highly prevalent with patients with type 1 and type 2 diabetes

"Biochemical and clinical vitamin B12 deficiency has been demonstrated to be highly prevalent amount patients with type 1 and type 2 diabetes mellitus"

You can read about the controlled study with the link below. ⠀
https://headachejournal.onlinelibrary.wiley.com/doi/abs/10.1111/head.13618⠀