There should not be any issue with Vit D and K2 with iron overload. John's been on both in addition to other anti-oxidants. The one you need to watch is when you start chelation. That is vitamin C. I wouldn't use it when first starting chelation. Eventually, you can add it in. You shouldn't exceed 250 mg.
Marlene, wife to John DX w/SAA April 2002, Stable partial remission; Treated with High Dose Cytoxan, Johns Hopkins, June 2002. Final phlebotomy 11/2016. As of January 2017, FE is 233, HGB 11.7, WBC 5.1/ANC 4.0, Plts 90K.