You need to take Spatone.
It comes in little satchets and you just pour it into juice.
Its basically water with iron in. It doesnt make you constipated like iron tablets do.
Take it with orange juice as vitamin C helps to absorb iron.
Avoid alcohol, caffine, fizzy drinks and tea as that stops iron absorbing.
Also eat lots of food with iron in such as red meats, dark leafy green veg like brocoli spinach, cabbage etc.