How to Choose an Iron Supplement in India: A Practical Buying Guide

Choosing an iron supplement in India comes down to three things: the form of iron, how much elemental iron it actually delivers, and whether you can tolerate taking it every day. Most people who give up on iron do so not because it failed but because it upset their stomach. The National Family Health Survey found 57 per cent of Indian women aged 15 to 49 were anaemic in 2019 to 2021, up from 53 per cent in the previous round. NFHS-6, released in May 2026, dropped anaemia from its indicator list entirely, so NFHS-5 remains the most recent national picture. The ICMR-NIN 2020 guidelines set the recommended dietary allowance at 29 mg of iron a day for Indian women of reproductive age, 19 mg after menopause, and 19 mg for adult men. Those numbers are the yardstick for reading any supplement label.

What does "elemental iron" mean on a label?

This is the most useful thing to understand, and the thing most labels obscure. Iron supplements are compounds: ferrous sulphate, ferrous fumarate, ferrous bisglycinate and carbonyl iron all bind iron to something else, and the compound weight is always larger than the iron weight. A tablet listing "ferrous sulphate 200 mg" delivers roughly 65 mg of elemental iron. The elemental figure is the one that counts towards your daily intake, and a well written label states it explicitly, usually as "equivalent to elemental iron". If a label gives only the compound weight, you cannot tell how much iron you are actually getting, and you should treat that as a reason to look elsewhere.

Which form of iron is gentlest on the stomach?

Ferrous sulphate is the cheapest and most widely prescribed form. It is also the one most associated with nausea, constipation and a metallic aftertaste. Ferrous bisglycinate binds iron to the amino acid glycine, and because it stays chelated as it passes through the stomach it tends to cause less gastric irritation. Research generally finds it is absorbed at least as well as ferrous sulphate at lower doses. It costs more per tablet. If you have abandoned iron before because of side effects, changing the form is the first thing to try, not increasing the dose.

How much iron do you actually need?

For prevention and for topping up a mild shortfall, a dose in the region of the RDA is usually appropriate. Doses of 60 to 100 mg elemental iron are therapeutic and are normally used to correct diagnosed iron deficiency anaemia under medical supervision. More is not better. The body stores excess iron rather than excreting it, so unnecessary high dose supplementation carries genuine risk, particularly for people with haemochromatosis or thalassaemia trait, which is not rare in parts of India. If you are considering a high dose, get a ferritin test first rather than guessing.

What helps iron absorb, and what blocks it?

Vitamin C meaningfully increases absorption of non-haem iron, which is why iron formulas often include it and why amla appears in Ayurvedic iron preparations. Tea, coffee, calcium supplements and dairy all reduce absorption, so leaving about two hours between them and your iron is worth the effort. Taking iron on an empty stomach improves absorption but worsens side effects. If you cannot tolerate it that way, take it with a light meal and accept slightly lower absorption in exchange for actually finishing the course. A tolerated dose taken for three months beats an optimal dose abandoned in week two.

How long before you notice a difference?

Fatigue often eases within two to four weeks. Haemoglobin usually takes two to three months to normalise, and refilling iron stores takes longer again, which is why doctors commonly continue iron for around three months after haemoglobin has recovered. Judging a supplement after a fortnight is the most common mistake people make.

What to look for on the label

• The elemental iron figure stated explicitly, not just the compound weight
• The specific form named, such as ferrous bisglycinate, rather than just "iron"
• Vitamin C or a vitamin C source such as amla if absorption is a concern
• Folate and vitamin B12, since these deficiencies often travel alongside iron deficiency
• A dose you can realistically keep taking for three months

When to see a doctor rather than self-supplement

Iron deficiency is a symptom, not a diagnosis. In adults, unexplained iron deficiency needs its cause investigated rather than simply corrected, because heavy menstrual bleeding, coeliac disease and gastrointestinal blood loss are all common causes and two of those need treating in their own right. If you are pregnant, if your fatigue is severe, or if you have deficiency that keeps returning after treatment, speak to a doctor rather than working through supplements on your own.

Frequently asked questions

Should I take iron in the morning or at night? Whichever you will remember. Absorption is slightly better away from meals, but consistency matters more than timing.

Can I take iron and calcium together? Better not to. Calcium competes with iron for absorption, so separate them by a couple of hours.

Does black stool mean something is wrong? No. Darkened stool is expected on iron and is harmless. Stool that is black and tarry with a strong odour is different and needs medical attention.

This article is for general information and is not a substitute for medical advice. Iron supplementation should be guided by a blood test and, where deficiency is significant, by a doctor.