Doing the quadruple dose of ferrous sulphate now, and so far no problem.

I'll keep the Proferrin in mind, in case I start struggling. I like the idea that it's made from stuff that would normally go to waste at the slaughterhouse. (used to eat a lot of blood pudding as a kid, so I have no problem with how Proferrin is made)

I also cook nearly every day in cast iron. Sometimes I can taste the iron from that, but I'm not sure how well it gets absorbed.

The vit C helping absorption is something I completely forgot about! Thanks for the reminder!