What is it with the way they named Vitamins?
There is only one A, I guess a dozen B's from B-1 to B -1. One C, I think three D's and an E.
I have not heard of Vitamins G, H, I, or J ,but, as you say, there is a K.
They use the Greek alphabet for waves and rays, and names for things of which there are seven: Dwarves, Deadly Sins, United Arab Republics and days of the week.