So--okay--my OH was telling me that Alton Brown just did a bit on FN where he used a magnet next to a "nutrition" cereal (ie - vector) and little metal flecks stuck to the magnet!? Like; they are part of the cereals formula?

I looked it up and I can't seem to find it???

He scared me: and assured me that Mr. Brown said this was safe. Now, I trust Alton...not sure I trust my OH on this.
But I DO trust seriousEaters...so:

Can anyone substantiate this and provide info/link or something?

I'm really curious.
TIA - hungrychristel :D