If you may choose to eat some Wild grown Cold water Ocean fish like Alaskan Salmon or sardines, these may provide you Vit D as well as many other Goodies for your body !
You can buy these year around in tin cans and I just eat them right from the can with some mustard and vegetable season salt and some of my wife's homemade whole wheat buns with real butter on the buns !
As far as the boron and the Alkalizing drink, you may get what boron you need in the Blackstrap Molasses !
Edit: You may also buy Vit D in capsules to take if you want or take cod liver oil, etc to provide for Vit D !
Smile Tis your choice.