It depends on how low your Vit D levels are. I took 10,000 IU for 30 and now I take 5,000 IU per day because I am chronically low. A normal person could safely take 2,000 IU per day forever. You might want to take 5,000 IU for a month and then reduce to 2,000 IU.

remember any amnio acid chelated iron is fine, no need for special iron.