I am not sure about what would constitute "huge amounts", but I have taken several drops of Magnascent and half a dropper of SSKI for a long time. Now, some folks claim that my grey hair is kind of blondish these days - but I don't really see it and don't know from whence it might come anyway. I definitely have thicker hair and faster hair growth - and I am sure that is mostly a side effect of regularly taking oleander (thicker and faster nail and hair growth are commonly reported).
I wonder what including some topical iodine on the scalp might do?