I am a midwife. Floradix is my go to for clients. Occasionally, I have a client that does not respond to Floradix in which case I recommend Garden of life raw iron. It is a vegetarian friendly blend and gluten free. I have never had one or the other fail. However, with your sensitive stomach issues you might want to try the Garden of life over the Floradix as some of my clients have had some tummy upset with it. However, this is not a medical recommendation. Obviously I have never seen you nor do I know the condition causing the low iron. So please don't take my advice but do your own research:)