Your Iron Savings Account
Ferritin is the protein that stores iron in your cells—like a savings account for iron. When you need iron (to make hemoglobin, for example), you withdraw from ferritin stores. Low ferritin means your savings are depleted—even if hemoglobin is still normal, you're running on fumes. High ferritin can mean iron overload or inflammation.
What is Ferritin?
Ferritin reflects total body iron stores. It's the most sensitive marker for iron deficiency. However, it's also an "acute phase reactant"—rising with inflammation, infection, and liver disease. Optimal is 50-150 ng/mL; under 30 suggests deficiency.
↑ What High Ferritin Means
Either you have too much iron stored (iron overload) OR there's inflammation (ferritin rises as an acute phase reactant). The distinction matters—check CRP to help differentiate.
Common symptoms:
If iron overload: joint pain, fatigue, abdominal pain, bronze skin · If inflammation: symptoms of underlying condition
↓ What Low Ferritin Means
Your iron stores are depleted. This is the earliest and most sensitive marker of iron deficiency—it drops before hemoglobin does. You may already be symptomatic.
Common symptoms:
Fatigue even without anemia · Brain fog and poor concentration · Restless legs · Hair loss · Exercise intolerance · Pica (craving ice, dirt) · Brittle nails · Cold intolerance
Why It Matters
When normal:
Best marker of iron stores
Drops before anemia develops
Early warning of deficiency
Guides supplementation decisions
Risks if abnormal:
Low ferritin: fatigue, brain fog, hair loss, exercise intolerance even without anemia
High ferritin: organ damage from iron overload (if truly elevated iron)
What Can Cause Abnormal Levels?
Iron Deficiency
80% likelyInadequate intake, poor absorption, or chronic blood loss (heavy periods, GI bleeding).
Inflammation
50% likelyFerritin rises as acute phase reactant—may not reflect true iron status.
Heavy Menstrual Periods
Monthly iron loss in women.
Vegetarian/Vegan Diet
Plant iron is less absorbable.
GI Conditions
Celiac, Crohn's reduce absorption.
What You Can Do
Heme iron sources: beef liver, oysters, red meat
Impact: Heme iron is 2-3x more absorbable \u00B7 Timeline: 4-8 weeks
Pair plant iron with vitamin C (bell peppers, citrus)
Impact: Doubles non-heme iron absorption \u00B7 Timeline: Immediate
Avoid tea/coffee within 1 hour of iron-rich meals
Impact: Tannins block 60% of absorption \u00B7 Timeline: Immediate
If lifestyle changes aren't enough:
Ferrous sulfate: 325mg with vitamin C on empty stomach
Impact: Can raise ferritin 30-50 ng/mL in 3 months \u00B7 Timeline: 8-12 weeks
Take iron every other day (better absorption than daily)
Impact: Higher absorption efficiency \u00B7 Timeline: 8-12 weeks
Recommended retest: 3 months after starting treatment
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