Iron Deficiency in Midlife Women: What Works, What Does Not, and Why

Iron deficiency is one of the most overlooked contributors to fatigue, brain fog, low mood, poor concentration, hair thinning, and reduced exercise tolerance in women during perimenopause and menopause. Yet despite how common it is, many women are told their blood tests are “normal” when, clinically, their iron stores are far from optimal.

At Bristol Menopause Clinic, we frequently see women whose menopausal symptoms only partially improve with HRT because an underlying iron deficiency has never been properly identified or treated.

The reality is simple: treatment is not just about taking iron. The type of iron, how it is taken, what is preventing absorption, and understanding the root cause all matter enormously.

Why Iron Deficiency Is So Common in Midlife Women

Iron depletion often develops gradually over years. Heavy menstrual bleeding, restrictive dieting, gastrointestinal conditions, thyroid disease, stress-related digestive issues, and long-term medication use can all contribute.

The challenge is that the symptoms overlap significantly with menopause itself:

• Fatigue

• Brain fog

• Poor concentration

• Anxiety or low mood

• Hair thinning

• Reduced stamina

• Poor sleep

• Palpitations

• Restless legs

  
  

As a result, many women assume hormones are the only explanation.

Treatment Options: What Actually Works

1. Iron Supplementation

Iron supplementation can be highly effective — but the form of iron matters considerably.

Many women are prescribed traditional ferrous salts, which are inexpensive and clinically effective, but often poorly tolerated. Gastrointestinal side effects are one of the biggest reasons women stop treatment too early.

Alternate Day Dosing: A More Effective Strategy

Emerging evidence suggests that alternate-day dosing may actually improve iron absorption compared with daily supplementation.

This relates to the hormone hepcidin, which rises after taking iron and temporarily blocks absorption for up to 24 hours. Taking iron every other day may therefore improve overall uptake while reducing gastrointestinal side effects.

For many women, this approach is both more effective and easier to maintain long term.

Optimising Iron Absorption

Iron is one of the most absorption-sensitive nutrients in human physiology. Two women taking the same supplement can absorb vastly different amounts depending on timing, medications, and dietary habits.

Take Iron with Vitamin C

Vitamin C improves the absorption of non-haem iron by converting it into a more absorbable form.

Helpful combinations include:

• Iron with kiwi fruit

• Iron with berries

• Iron with citrus juice

• Iron with tomatoes or peppers

  
  

Avoid Tea and Coffee Around Supplement Timing

Tea and coffee contain tannins that significantly reduce iron absorption. Even herbal teas such as peppermint may interfere.

Avoid these for at least one hour either side of taking iron.

Separate Iron from Calcium

Calcium competes directly with iron absorption. Avoid taking iron alongside:

• Milk

• Cheese

• Calcium supplements

• Calcium-fortified products

Ideally, allow a two-hour gap.

Thyroid Medication Timing Matters

Iron can reduce the absorption of levothyroxine.

Women taking thyroid medication should separate iron and levothyroxine by at least two hours.

Cooking in Cast Iron

Cooking acidic foods such as tomato sauces or stews in cast-iron cookware can meaningfully increase the iron content of meals, a simple but clinically useful habit.

Dietary Optimisation

Diet alone is rarely enough to correct significant iron depletion, but it plays an essential role in long-term maintenance.

Haem Iron: Best Absorbed

Haem iron is absorbed efficiently regardless of other dietary factors.

Best sources include:

• Red meat

• Lamb

• Dark poultry meat

• Shellfish

• Clams

• Oysters

• Liver (avoid during pregnancy)

  
  

Non-Haem Iron: More Difficult to Absorb

Plant-based iron sources are less efficiently absorbed and highly dependent on what they are eaten with.

Sources include:

• Lentils

• Chickpeas

• Kidney beans

• Tofu

• Pumpkin seeds

• Quinoa

• Fortified cereals

• Dark leafy greens

  
  

Improving Plant-Based Iron Absorption

Pairing plant iron with vitamin C-rich foods significantly improves absorption.

Examples include:

• Lemon juice on spinach

• Tomatoes with lentils

• Red peppers in bean dishes

• Citrus dressings on salads

For vegetarian and vegan women with depleted ferritin levels, supplementation is often clinically necessary rather than optional.

Addressing the Underlying Cause

Correcting ferritin without understanding why it became depleted often leads to recurrence.

Common reversible causes include:

Heavy Menstrual Bleeding

Perimenopausal bleeding changes are one of the most common contributors to iron depletion. Appropriate hormonal treatment, including HRT, may significantly reduce ongoing losses.

Coeliac Disease

Undiagnosed coeliac disease can impair iron absorption even in women with an otherwise healthy diet.

Women with persistently low ferritin despite supplementation should be screened.

Helicobacter pylori Infection

This common stomach bacteria can interfere with iron absorption. Eradication therapy may restore normal absorption.

Proton Pump Inhibitors (PPIs)

Long-term reflux medications reduce stomach acid, impairing iron absorption.

Medication reviews are often worthwhile.

Thyroid Disease

Hypothyroidism is associated with impaired iron absorption and reduced energy metabolism.

Treating thyroid dysfunction frequently improves iron status.

Monitoring Your Response

Iron replacement is not a quick fix.

Expect a 3–6 Month Process

Ferritin restoration takes time. Many women feel discouraged when they do not notice immediate improvement.

Meaningful replenishment usually takes:

• Around 3 months for early improvement

• Up to 6 months or longer for full restoration

  
  

Recheck Blood Tests

Repeat testing should ideally include:

• Ferritin

• Full blood count

• CRP

• Vitamin B12

• Folate

Monitoring ensures levels are improving appropriately and helps guide maintenance therapy.

Optimal Ferritin Matters

Many laboratories classify ferritin levels around 15–30 µg/L as “normal”.

Clinically, however, many symptomatic women feel significantly better when ferritin reaches:

• 70–100 µg/L

Normal is not always optimal.

The Menopause Connection

Iron deficiency and menopause frequently coexist — and they often amplify one another.

In clinic, we commonly see women whose HRT has improved symptoms partially, but who continue to experience:

• Fatigue

• Brain fog

• Hair shedding

• Low resilience

• Reduced exercise tolerance

When ferritin is investigated and corrected appropriately, the improvement can be significant.

Equally, effective menopause management may help preserve iron stores by reducing heavy or erratic bleeding patterns.

Treating hormones without addressing nutritional status often produces incomplete results. The best outcomes come from looking at the whole picture.

When Should You Seek Further Investigation?

If you are experiencing persistent:

• Fatigue

• Brain fog

• Hair loss

• Poor recovery

• Low mood

• Symptoms despite otherwise healthy lifestyle habits

…it is worth investigating iron properly.

Recommended blood tests include:

• Serum ferritin

• Full blood count

• Active B12

• Folate

• CRP

• Thyroid function

• Vitamin D

  
  

If ferritin is below 70 µg/L and symptoms are present, treatment may still be clinically appropriate, even if you are not anaemic.

“Normal” is not always the same as optimal and you deserve to know the difference.