The article explains why iron supplements may not be effectively raising haemoglobin levels, a common frustration particularly in India where anaemia is widespread, highlighting that absorption is significantly hindered by dietary factors like tea, coffee, milk, and phytates found in whole grains and legumes, and recommending timing supplements away from these and pairing them with Vitamin C for better absorption. It also emphasizes the superior absorption of heme iron from animal sources compared to non-heme iron from plants and points out that haemoglobin production requires not only iron but also adequate protein, vitamin B12, and folate, deficiencies of which are common and often overlooked, suggesting that if haemoglobin levels aren't improving, testing for these other nutrients and assessing overall protein intake is crucial, and that alternative, better-absorbed iron supplements like heme-iron options exist for those experiencing side effects from standard ferrous sulfate.

The article explains why iron supplements may not be effectively raising haemoglobin levels, a common frustration particularly in India where anaemia is widespread, highlighting that absorption is significantly hindered by dietary factors like tea, coffee, milk, and phytates found in whole grains and legumes, and recommending timing supplements away from these and pairing them with Vitamin C for better absorption. It also emphasizes the superior absorption of heme iron from animal sources compared to non-heme iron from plants and points out that haemoglobin production requires not only iron but also adequate protein, vitamin B12, and folate, deficiencies of which are common and often overlooked, suggesting that if haemoglobin levels aren't improving, testing for these other nutrients and assessing overall protein intake is crucial, and that alternative, better-absorbed iron supplements like heme-iron options exist for those experiencing side effects from standard ferrous sulfate.

The article explains why iron supplements may not be effectively raising haemoglobin levels, a common frustration particularly in India where anaemia is widespread, highlighting that absorption is significantly hindered by dietary factors like tea, coffee, milk, and phytates found in whole grains and legumes, and recommending timing supplements away from these and pairing them with Vitamin C for better absorption. It also emphasizes the superior absorption of heme iron from animal sources compared to non-heme iron from plants and points out that haemoglobin production requires not only iron but also adequate protein, vitamin B12, and folate, deficiencies of which are common and often overlooked, suggesting that if haemoglobin levels aren't improving, testing for these other nutrients and assessing overall protein intake is crucial, and that alternative, better-absorbed iron supplements like heme-iron options exist for those experiencing side effects from standard ferrous sulfate.

You've been taking your iron tablets religiously, every single day, sometimes twice a day, just like the doctor said. Weeks have passed, and yet your haemoglobin hasn't moved much. You still feel just as tired, and the reports look the same, too. What's going on?

This is one of the most common and most frustrating situations in nutritional health, particularly in India, where anaemia affects an enormous proportion of the population.

Iron has a long journey inside your body

First, understand this: swallowing an iron tablet is just the beginning. That iron has to be absorbed through your small intestine, travel through your bloodstream, and reach your bone marrow, and only then does your body use it to build new red blood cells and raise your haemoglobin. That's a long chain of events, and it can go wrong at any point along the way.

Most people assume that the tablet is doing its job. Often, it isn't.

Most of it may not even be getting absorbed

This is the part nobody explains properly at the pharmacy counter. According to research published by the National Library of Medicine, iron absorption from oral supplements ranges from just 2% to 28%, depending on what you eat alongside it. At worst, 98% of what you're swallowing is not getting in. Let that sink in for a moment.

And in an Indian household? The odds are stacked against absorption. Several things make this worse. Tea, coffee, and milk, all staples of the Indian diet, are iron absorption blockers. Calcium and iron compete for the same absorption pathway, so taking your iron tablet with milk or right after a dairy-heavy meal significantly reduces how much actually gets in. Phytates, found in whole grains, legumes, and cereals, are again a core part of Indian eating, and bind to iron and reduce its absorption too.

None of this means stop eating these foods. It means be thoughtful about timing. Always take your iron tablet away from these foods before having your food. And pair it with something vitamin C-rich - a glass of nimbu paani, a small piece of amla, or a guava. Vitamin C is one of the most powerful enhancers of iron absorption we know of. Use it.

Heme iron: The form your body actually prefers

Iron in food comes in two forms. Non-heme iron comes from plants: green leafy vegetables, dals and fortified cereals. Heme iron comes from animal foods like eggs, chicken, fish, and red meat. These two forms are not equal. Not even close.

Non-heme iron doesn't get an easy ride...The chai, the calcium, the phytates- they all get in the way. Heme iron doesn't play by the same rules. It is absorbed through a completely separate pathway, and your diet barely touches it. Absorption rates are two to three times higher than those of non-heme iron, consistently.

So if your diet is entirely plant-based, even if you're eating palak, beetroot, and rajma every day and your haemoglobin isn't moving, this is likely a significant part of why. Including heme-iron sources like chicken, fish and eggs makes a meaningful difference. 

Iron is not the only missing piece

Haemoglobin is not built from iron alone. Imagine building a house: iron is the steel frame, essential but completely useless without cement, bricks, and skilled workers. Your body needs protein, vitamin B12, and folate, all working together to build and sustain red blood cells.

Haemoglobin is itself a protein, made of globin chains wrapped around an iron core. If your overall protein intake is poor, your body simply does not have the raw material to produce haemoglobin, regardless of how much iron is circulating. If your meals are predominantly rice, roti, sabzi, and very little protein, your haemoglobin recovery will be slow, no matter what supplements you take.

Vitamin B12 deficiency is rampant in India, particularly in vegetarian and vegan populations, and it is almost never tested routinely alongside haemoglobin. B12 is essential for the production and maturation of red blood cells. Without it, red blood cells become large, malformed, and ineffective, a condition called "megaloblastic anaemia" that can co-exist with iron deficiency and creates a picture that oral iron will never fully resolve on its own.

Folate works alongside B12 in the same process. Both need to be checked.

If your haemoglobin isn't moving, get tested for B12 and folate, and take an honest look at your protein intake. Not just your iron.

The tablet you're taking also matters

Not all iron supplements are the same. The most commonly prescribed form in India is ferrous sulfate. It works for many people, but it comes with a catch — nausea, constipation, and acidity. These side effects are well-documented, and research has identified poor stomach tolerance as one of the primary reasons people quietly reduce their dose or stop taking the supplement altogether without telling their doctor.

Heme-iron supplements are a gentler, better-absorbed alternative. They cause significantly fewer side effects and are absorbed more efficiently than ferrous sulfate. They are not always the first thing prescribed, but if your stomach is struggling or your numbers aren't moving, they are absolutely worth asking your doctor about.

What I'd tell you if you were sitting across from me

*Take your iron tablet before meals, away from chai, coffee, and dairy.

Pair it with something vitamin C-rich - nimbu paani, amla, guava.

If you eat eggs, chicken, or fish, include them regularly. Heme iron is your ally.

*Eat enough protein at every meal, not just iron-rich foods, but protein.

*Get tested for B12, folate, and vitamin D. Don't assume it's only iron.

If weeks have passed with no improvement, push for answers.

Low haemoglobin is rarely just about iron. It is about the full picture: what your body has, what it lacks, and what might be getting in the way.

The opinions expressed in this article are those of the author and do not purport to reflect the opinions or views of THE WEEK. 

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