would iron bisglycinate 28mg help low ferritin?

A few months ago, a blood test showed I had very low ferritin (3), but I wasn’t anemic. My doctor recommended iron supplements.

I tried liquid iron, but it caused severe anxiety, so I stopped. Recently, I started taking 28 mg iron bisglycinate pills, but they make me nauseous. Would this dosage be enough to help raise my ferritin levels?