Who would have thought – a link between Vitamin A deficiency and chronic callusing? It is true that some have more callusing issues than others and managing chronic callusing is more than a cosmetic issues for those with diabetes and peripheral neuropathy so this may be of interest to many.
Vitamin A affects skin and vision, among other things, and callusing is a skin problem so it makes sense that a deficiency could be involved. For more, here is an article by a physician that explains it and even gives recommendations on therapy doses.
To be safe, if you believe this might be of benefit to you, run out a paper copy of the article and take it to your physician before embarking on any doses larger than the recommended daily allowances.