Anaemia is a common health problem in women. It is often due to iron deficiency. Anaemia is a particular problem during pregnancy and is bad for the mother and baby. It is best to treat anaemia in young women well before they get pregnant. Doctors treat anaemia with iron and vitamins. But some people get side effects when taking iron tablets and so they stop taking them. Heavy menstrual periods are a common cause of iron deficiency and even if women do take iron, because they lose so much iron in their periods, they still become iron deficient. Tranexamic acid (TXA) is a medicine used to treat heavy periods. The investigators of this study would like to find out if taking TXA with the usual iron and vitamin supplements is better at treating anaemia than taking iron and vitamin supplements alone. (Lay Summary)