If it helps I emailed a pharmacist at a natural health store a while ago with the question of turmeric and iron, this is the answer I got back
Many thanks for getting in touch and for your enquiry.
The information around turmeric and its role in iron absorption is mixed, there are some individual case reports are available that do mention iron absorption is reduced whilst taking turmeric but with a huge variation in the rate of this effect from 10/20% to 90% and there may be other factors at play. Unfortunately this isn’t something that I can say definitively is related to a turmeric supplement. In general, the only concerns when considering taking a turmeric supplement would be for anyone prescribed a blood thinning medication as, in theory, turmeric can enhance the effect of these medications and risk an inadvertent bleed.
To this end...my advice is that as you know your current ferritin levels and are having these monitored periodically whilst also taking an iron replacement treatment you could try 1 Natruflex daily after food. I agree, take this at a time in the day that is separated from the iron supplement (take the iron first). Our turmeric is fat soluble and so having it after food will increase its absorption and maximises it effects for you.
I hope this is helpful. Please get back in touch if I can answer anything further.
Kind regards