“Expression of Cb-D28k, in particular, appears to be regulated by dietary supplementation of vitamin D and vitamin A. VDRs, however, tended to be upregulated when animals were not supplemented with Ca, vitamin D and vitamin A. This may be due to the decreased Ca concentrations which caused vitamin D activation in the skin without any supplementation, but UVB exposure.”…
https://onlinelibrary.wiley.com/doi/full/10.1111/jpn.12206
https://onlinelibrary.wiley.com/doi/full/10.1111/jpn.12206
