Vitamins are vitamins. When you are trying to supplement a specific one it's often easier to use human ones. Many animal ones are combinations. They're the same vitamins, human ones are just easier to find in many cases. If you give some cooked egg, a bit of canned tuna, or sunflower seeds...
Most tractor supply stores, and feed stores will carry electrolites for chickens (not usually very expensive). Sav-a-chick is a common one. You can also make your own if needed:
https://www.fresheggsdaily.blog/2017/05/how-to-make-homemade-electrolytes-for.html
Here is more info on wryneck, it...