How Long Do Iron Supplements Take To Work?

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    Many people feel the positive effects of taking an iron supplement after three weeks, but it may take up to 12 weeks to feel a noticeable increase in iron and energy levels¹. 

    Iron needs differ from person to person; as such, everyone feels the effects of iron supplementation on their own timelines. Each person will experience different levels of sensitivity, side effects, and positive improvements from iron supplements. 

    Here we will break down some of the most common questions about restoring iron levels, so you can be confident that you are getting the most from your iron supplement.  

    How Long Will My Iron Supplement Take To Work & What Does That Mean? 

    If you were to Google “How long does it take for iron supplements to work?” the current AI-generated answer suggests one to four weeks. However, it’s impossible to predict exactly when you’ll feel the effects. Several factors influence iron absorption and the rate at which your body responds, including the time of day you take iron, your overall iron requirements, and your individual metabolism. It’s also important to distinguish between how long it takes for iron to “work” (typically when you notice improved energy) and how long it takes for your body to absorb iron. 

    How Long Does It Take Active Iron To Work?  

    Active Iron is clinically proven to increase iron and energy levels within six weeks¹, though many people notice improvements after about three weeks. The timing depends on how efficiently your body absorbs iron. Active Iron is formulated for optimal absorption², helping your body gradually build iron stores so you can start feeling the benefits within a few weeks, depending on individual differences. Active Iron is also clinically proven to be gentle and non-constipating and can be taken on an empty stomach.

    How Long Does It Take For Your Body To Absorb Iron? 

    The time it takes to restore iron in your body depends on several factors: 

    • Reason for low iron levels: Low iron due to poor diet, heavy periods, or blood loss can affect how quickly your levels recover. 

    • How low your levels are: The further below normal your iron levels are, the longer it takes to replenish them. 

    For example, if you experience regular or heavy periods, it may take longer to rebuild iron stores because you continue to lose iron. On the other hand, if dietary intake is low but supplementation is consistent, iron levels can improve more steadily, especially with supplements designed for good absorption. 

    What To Consider When Taking Iron Supplements 

    Maintaining an iron-rich diet can be challenging, especially if you follow a restricted diet, e.g. vegetarian.  

    Foods that can reduce iron absorption 

    Certain foods and nutrients naturally inhibit iron absorption, making it harder to reach optimal iron levels. These include: 

    • Phytic acid (commonly found in grains and legumes) 

    • Tannins 

    • Polyphenols (found in tea, coffee and matcha) 

    • Milk 

    • Caffeine 

    • Some proteins present in soybeans 

    Given that many people start their day with a cup of coffee or a bowl of milk and cereal, it’s easy to see why getting enough iron can be a challenge. 

    Foods That Can Increase Iron Absorption 

    Some foods can increase your body’s ability to absorb iron and are often recommended alongside iron supplements. These include: 

    • Citrus fruits and citric acid – lemons, oranges, orange juice 

    • Vitamin C-rich foods 

    • Foods containing vitamin A and beta-carotene 

    Incorporating these foods into your diet can help improve iron absorption and support your overall iron levels. 

    If you feel tired and fatigued all the time or suspect having low iron levels, the best step is to consult your GP. They can perform a blood test to identify whether low iron is contributing to your wellbeing and determine the underlying cause. When you speak to your GP, we would recommend asking them to check both your ferritin and haemoglobin levels, as these give a fuller picture of your iron stores and overall iron status. Based on the results, your GP can advise if an iron supplement would be suitable for you. 

    Conclusion: How Long do Iron Supplements take to Work? 

    Iron supplementation can take several weeks to show noticeable effects, with timing varying based on individual needs, absorption efficiency, and dietary factors. Combining supplements with an iron-friendly diet can support faster recovery. Active Iron is a good choice for those looking for a supplement, as it is clinically proven to increase iron and energy levels¹ while being gentle on the stomach.  

    Iron Absorption FAQ’s 

    How quickly do iron supplements work? 

    Many people feel the positive effects of taking an iron supplement after three weeks, but it may take up to 12 weeks to feel a noticeable increase in iron and energy levels. 

    How long should I take iron supplements for? 

    Iron supplements should be taken for at least 6 months and up to 12 months. The best way to ensure adequate absorption is to take them on an empty stomach or allow 2 to 3 hours between meals, as certain foods, drinks, and medicines may inhibit iron absorption. 

    How long does it take to raise iron levels with food? 

    Raising iron through diet alone can be difficult, especially for those with increased needs, e.g. restricted diets, pregnancy, and heavier periods. Dietary iron comes in two forms: Haem and Non-Haem. Haem iron, found in red meat, offal, and poultry, is absorbed more easily and is best for boosting iron levels. Non-Haem iron sources include fortified cereals and leafy greens like broccoli and cabbage.  

    How do you know if iron tablets are working? 

    Everybody responds to iron supplements differently, but most people can expect to see an improvement in their energy levels, an improvement in their ability to concentrate and a healthier immune system.  

    These signs may not be very pronounced, so it’s still important to review how much iron you consume through your diet and how well your iron pills are being absorbed. 

    If you have any concerns that your iron pills are not working, you should consult your GP.  

    Sources:  

    1. Ledwidge, M. et al. PRECISION Study. Int J Clin Pharm (2023) https://doi.org/10.1007/s11096-023-01640-7  

    1. Wang et al. 2017, Acta Haematologica, 

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