Seeking advice for iron deficiency and IV Infusion

I had to have IV iron infusions because after taking oral supplements for years, my levels were still super low. In my case it’s because I have Crohns and intestinal inflammation was preventing nutrients from being absorbed as well as they should be. I looked up “how long do iron supplements take to work” and it looks like the answer is about 1-4 weeks. So the supplements could still kick in. One piece of advice my doctors gave me is that having Vitamin C with iron helps your body absorb the iron. To achieve that, you could either take another supplement, or you could take your iron with orange juice.

I have just had my second infusion done 2 weeks ago. I need to get my blood's checked again next week. My first one really worked for me. But for some reason it never stays in the right range for more than a year.