What are red blood cells, and how are they produced?
Red blood cells (erythrocytes) are the most abundant type of blood cell—about 4.5 to 5.5 million per microliter in adults. Their primary role is to transport oxygen from the lungs to all tissues and to return CO₂ to the lungs, thanks tohemoglobin (Hb), a four-chain protein that contains iron. Supplements to support red blood cell formation are available in the store’s iron and blood vitality line.
- Structure: biconcave disc (anucleate—allows for deformation in capillaries) — 99% of the cell’s content is hemoglobin — lifespan of 110 to 120 days — eliminated by the spleen (physiological hemolysis) — the iron in hemoglobin is recycled (stored as ferritin)
- Erythropoiesis (production): red bone marrow — stimulated by erythropoietin (EPO), a renal hormone released in response to tissue hypoxia — ~2 million red blood cells produced per second in a healthy adult — essential nutritional factors: iron, vitamin B12, folate (B9), vitamin B6
- Complete blood count (CBC) parameters: hemoglobin (Hb—normal: 12–16 g/dL, 13–18 g/dL)—hematocrit (Ht) — MCV (mean corpuscular volume — 80–100 fL: normocyte, < 80 : microcyte, > 100: macrocyt) — MCH (mean corpuscular hemoglobin concentration) — RDW (red blood cell distribution width: > 14.5% = anisocytosis)
- See a doctor if: persistent fatigue + pallor + shortness of breath on exertion → complete blood count (CBC) + ferritin + B12 + folate
What conditions affect red blood cells?
- Anemia: Hb < 12 g/dL or < 13 g/dL — insufficient production or excessive loss — the three main forms based on MCV (microcytic iron-deficiency, normocytic inflammatory or hemorrhagic, B12/folate-deficient macrocytic) — see the anemia page for full details
- Polycythemia: excess red blood cells — primary (Vaquez disease — JAK2 mutation) or secondary (smoking, high altitude, COPD, EPO-secreting tumors) — blood thickening → risk of thrombosis (stroke, MI, DVT) — medical treatment (phlebotomy, hydroxyurea)
- Inherited hemoglobinopathies: sickle cell disease (HbS—stiffness of red blood cells—vascular occlusive crises)—thalassemias (deficit in globin chain synthesis—severe microcytic anemia)—diagnosis by hemoglobin electrophoresis
- Pathological hemolysis: premature destruction of red blood cells — autoimmune, mechanical (valve prosthesis), parasitic (malaria) — laboratory workup (decreased haptoglobin, elevated LDH, free bilirubin)
Nutrition and supplements to support red blood cell formation
- Iron: a central component of the heme group in hemoglobin — deficiency = the leading cause of anemia worldwide — heme iron (red meat, liver, seafood) is better absorbed than non-heme iron (legumes, spinach) — iron supplements available at pharmacies — take supplements only after a ferritin test (consult a doctor)
- Vitamin B12: cofactor for erythroblast maturation — deficiency → megaloblastic macrocytic anemia — vegetarians and vegans at risk — 2.4 µg/day (EFSA) — exclusively from animal sources (meat, eggs, fish, dairy products) or supplementation
- Folic acid (vitamin B9): synthesis of nucleotide bases for red blood cell division — deficiency → macrocytic anemia — green vegetables, legumes — 400 µg/day — EFSA claim regarding the formation of normal red blood cells
- Vitamin C: improves intestinal absorption of non-heme iron (×3 when taken together) — 500 mg to be taken with meals containing iron
- Spirulina: phycocyanin and plant-based iron — natural nutritional support for blood vitality — as a course of treatment
