This is the iron pill I take: https://www.walgreens.com/store/c/wa...253475-product

It does not mess up your GI tract.

But I donate blood as frequently as is allowed, so I must supplement with iron. I am just showing to you that there is a form of iron that would agree with your system if you wanted to try supplementation. There are other forms of iron that are rough on the GI tract.

I did not realize that one can react badly to vitamin D3 pills. I have been taking them for many years even though I eat plenty of yogurt and drink plenty of milk.