High Unawareness of Distal Sensorimotor Polyneuropathy
Most older adults with prediabetes or diabetes who have DSPN are unaware of their condition

Comes from this research
Older Subjects With Diabetes and Prediabetes Are Frequently Unaware of Having Distal Sensorimotor Polyneuropathy

Don't forget
Reversal of the Symptoms of Diabetic Neuropathy through Correction of Vitamin D Deficiency in a Type 1 Diabetic Patient
and the NATURAL point of human vitamin D equilibrium is 125nmol/l 50ng/ml and at that level vitamin D is most effective as an anti inflammatory agent.
Inflammation in the pathogenesis of microvascular complications in diabetes
How much do you need?
See this chart for the ADDITIONAL amount of IU required per LB or KG to raise from current 25(OH)D to above 125nmol/l opr 50ng/ml

and don't forget to optimise the switching for circulating vit d, calcidiol to calcitriol (active vit d hormone) requires MAGNESIUM and most of us get only half current magnesium RDA and that's too low.
Magnesium Deficiency Can Cause Neuropathy

In a similar anti inflammatory role we know that the OMEGA 3 DHA acts as a vitamin d ligand (helps activates calcitriol the active vit d hormone) and similarly plays A Role for Omega-3 Polyunsaturated Fatty Acid Supplements in Diabetic Neuropathy