Mercury and Seaweed

I'm a big fan of seaweed, so I found this article interesting, both the article and the comment connected to it, about mercury and seaweed. This article has had me curious enough to include a blood mercury test as part of my blood work that I need to do this year as part of my employer's benefit plan. Considering that I was fully vaccinated as a child (albeit by a much lighter CDC schedule years ago) I wonder how much mercury I've stocked up in my brain over the years... :)