Formulated with well tolerated iron bisglycinate (iron chelate). The iron is bound to amino acids making it well absorbed and gentle on the gut, unlike the sulphate form for example which can cause side-effects such as constipation. This form of iron is less likely to be blocked by other nutrients like calcium, or elements of the diet like tea or wholegrains which can impede absorption. Great for pre-menopausal women especially if they have heavy periods. Suitable for pregnancy and breast-feeding. Also suitable for men, especially if vegetarian or vegan. Can also be taken by children over 12 years, but especially girls as they hit puberty. Perfect for vegetarians and vegans who may have low dietary intake. Good for those who do lots of endurance exercise.