Iron deficiency is the most common nutritional deficiency globally and significantly more common in UK women than men. The symptoms — fatigue, brain fog, poor exercise capacity, hair loss, cold extremities — directly undermine weight loss by making exercise feel exhausting and reducing the energy needed for meal preparation and healthy decisions. But iron supplementation requires testing first — excess iron is harmful, and supplementing without confirmed deficiency is a common mistake.
Who is at risk of iron deficiency in the UK
| Group | Risk level | Primary reason |
|---|---|---|
| Premenopausal women | ⭐⭐⭐⭐⭐ High | Monthly menstrual blood loss; ~25% of UK women in this group are iron deficient |
| Pregnant women | ⭐⭐⭐⭐⭐ Very high | Increased demand for fetal development; NHS routinely tests |
| People on GLP-1 medication | ⭐⭐⭐⭐ High | Reduced food intake reduces dietary iron; especially relevant for women |
| Vegetarians and vegans | ⭐⭐⭐⭐ High | Non-haem iron from plants is less bioavailable than haem iron from meat |
| Regular blood donors | ⭐⭐⭐ Moderate | Repeated blood loss |
Iron supplement forms compared
| Form | Absorption | GI tolerance | Notes |
|---|---|---|---|
| Ferrous sulfate | ~12% absorption | ⭐ Poor — causes nausea, constipation, black stools | Most commonly prescribed by NHS; cheap but poorly tolerated |
| Ferrous bisglycinate (iron glycinate) | ~20–25% absorption | ⭐⭐⭐⭐⭐ Excellent | Best tolerated form; gentlest on GI; best choice for most people |
| Ferrous gluconate | ~12% absorption | ⭐⭐⭐⭐ Good | Better tolerated than sulfate; moderate absorption |
| Ferric pyrophosphate | ~8% absorption (without enhancers) | ⭐⭐⭐⭐⭐ Excellent | Food-grade form in fortified foods |
Best iron supplements UK 2026
| Product | Form | Cost/month | Verdict |
|---|---|---|---|
| Solgar Gentle Iron 25mg | Ferrous bisglycinate | ~£15–18 | ⭐⭐⭐⭐⭐ Best tolerated option |
| Floradix Iron + Herbs Liquid | Ferrous gluconate + food extracts | ~£18–22 | ⭐⭐⭐⭐ Well tolerated liquid form |
| Spatone Natural Iron Supplement | Natural iron water | ~£12–16 | ⭐⭐⭐⭐ UK brand; low dose; gentle |
| NHS ferrous sulfate 200mg | Ferrous sulfate | ~£2–4 | ⭐⭐ Cheap but poorly tolerated |
Before supplementing standalone iron
If Daily Fuel is already in your routine, it provides 100% NRV of iron in food-matrix form. This is appropriate and safe for daily use. Standalone iron supplements should only be added if a blood test confirms deficiency (low ferritin or haemoglobin). Over-supplementation without deficiency is not beneficial and can cause oxidative stress.
Frequently Asked Questions
What iron supplement is best for women in the UK?
Ferrous bisglycinate (iron glycinate) is the best-tolerated and well-absorbed form for women. Solgar Gentle Iron 25mg is one of the most widely available bisglycinate products in the UK. Liquid forms like Floradix are another well-tolerated option.
Can I take iron supplements every day?
Yes — most iron supplements are designed for daily use. Ferrous bisglycinate is particularly gentle and well-suited to daily use. Take with vitamin C (orange juice or a vitamin C supplement) to increase absorption by 3–4×. Avoid taking with calcium supplements or dairy, which reduce iron absorption.
What does iron deficiency feel like?
Persistent fatigue despite adequate sleep, brain fog, reduced exercise capacity, cold hands and feet, brittle nails, hair loss, and pale inner eyelids are the most common symptoms. These overlap with many other conditions — a blood test is the only reliable way to confirm deficiency.
Related: Hair Loss on Mounjaro UK | Women’s Weight Loss Supplements UK
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