Take iron on empty stomach with vitamin C, wait before coffee
The speaker notes that iron is often over-supplemented, and he has other videos on alternative approaches to anemia. However, for those who do take iron, this timing is critical. The 30–60 minute window allows the iron to be absorbed before the polyphenol 'handcuffs' arrive. He references data from the American Journal of Clinical Nutrition showing coffee inhibits iron absorption by up to 40% and tea by over 60%.
Non-heme iron requires an acidic environment for optimal solubility and absorption. Vitamin C reduces iron to its more absorbable ferrous form. Polyphenols in coffee/tea bind iron into large, inert complexes that cannot pass through gut transporters.
iron absorbs best in an acidic environment. So if you take iron with a little bit of vitamin C, it can increase the uptake a little bit more and you really need to wait like 30 60 minutes before having coffee or tea.

