Is my Zinc normal?
Free blood test checker · Standard + longevity-optimal ranges
What is a normal Zinc level?
Zinc is an essential trace mineral involved in immune function, wound healing, protein synthesis, DNA synthesis, and testosterone production. Deficiency affects an estimated 2 billion people globally and causes impaired immunity, slow wound healing, hair loss, and reduced taste/smell. Normal serum zinc is 60-120 µg/dL.
| Range | Values |
|---|---|
| Standard Reference | 60–120 µg/dL |
| Low Risk | < 50 µg/dL |
What causes abnormal Zinc levels?
Low zinc is caused by inadequate dietary intake (especially vegetarian/vegan diets due to phytate interference), malabsorption (celiac disease, Crohn's, short bowel syndrome), chronic diarrhea, liver disease, kidney disease, sickle cell disease, and certain medications (diuretics, PPIs). Alcohol impairs zinc absorption and increases urinary excretion.
When should you see a doctor?
See your doctor if zinc is below 60 µg/dL, if you have frequent infections, slow-healing wounds, hair loss, loss of taste or smell, or chronic diarrhea. Also consult before supplementing above 40 mg/day, as excess zinc can cause copper deficiency and interfere with iron absorption.
Zinc and longevity
Zinc is a critical cofactor for over 300 enzymes and is essential for immune surveillance, DNA repair, and hormonal balance — particularly testosterone synthesis. Zinc deficiency impairs thymic function and T-cell maturation, progressively weakening the adaptive immune system with age (immunosenescence). The zinc-copper balance is often overlooked: chronic zinc supplementation above 40 mg/day can induce copper deficiency, causing neurological symptoms and anemia. Conversely, excess copper (common in unfiltered tap water from copper pipes) can deplete zinc. Phytates in whole grains, legumes, and seeds bind zinc and reduce absorption by 20-45%, making vegetarians and vegans particularly vulnerable. Oysters are the single richest food source at ~74 mg per serving.
Where to get a Zinc test
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Related biomarkers
These biomarkers are often tested alongside Zinc for a more complete picture.
Frequently asked questions
What is a normal zinc level?
Who is at risk for zinc deficiency?
How much zinc should I take?
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Sources: Reference ranges based on AHA/ACC, ADA, and AACE clinical guidelines. Biological variation data from Ricos/Westgard database. Longevity-optimal ranges reflect targets used by preventive and functional medicine practitioners.
Last reviewed: April 2026. This tool provides general health information and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider about your specific results.