Iron supplements are often prescribed for anaemia or low iron stores, especially in women, children and some chronic conditions. They can be very effective but sometimes cause side effects like nausea, constipation or dark stools.
To improve absorption, iron is often best taken on an empty stomach or with a source of vitamin C (like orange juice or a fruit), unless your doctor advises otherwise. However, if stomach upset is strong, taking it with a small amount of food may help – just avoid tea, coffee or milk at the same time, as they can reduce absorption.
Splitting the dose or taking it on alternate days is sometimes recommended in newer guidance to improve tolerance and absorption, but this should be done according to your doctor’s instructions, not randomly.
If constipation occurs, increasing fluids, fibre and gentle activity can ease discomfort. Stools turning darker is a common, usually harmless effect of iron but should still be discussed during follow-up.
Most importantly, don’t stop supplements early just because you feel better. Anaemia can return if iron stores haven’t fully recovered. Regular blood tests and medical advice help decide when it’s safe to reduce or stop.