Educational profile — independent, evidence-informed overview. This content is not medical advice. Please consult your healthcare provider for personalised guidance.
🧬 Family & Essentiality
Mineral ClassTrace mineral
EssentialityEssential
Physiological FormZn²⁺ bound to enzymes & proteins (“zinc fingers”)
🌿 Plain-Language Summary
Zinc is vital for immune health, wound healing, taste and smell, growth, and DNA synthesis. Over 300 enzymes depend on zinc, making it one of the most versatile trace minerals. Deficiency can impair growth and increase infection risk, while chronic high intakes may upset the balance of other minerals like copper.
⚗️ Molecular & Chemical IDs
- Element: Zn (Zinc)
- Atomic number: 30
- Common supplement forms: gluconate, acetate, sulphate, picolinate
⚡ Functions
- Structural: zinc-finger transcription factors regulating gene expression
- Enzymatic: cofactor for oxidoreductases, ligases, and hydrolases
- Immune function: supports white blood cell development and epithelial barriers
- Growth & repair: wound healing, skin integrity, reproductive health
🍽️ Absorption & Bioavailability
May increaseAnimal proteins; soaking/souring of legumes/grains to reduce phytates
May decreasePhytate-rich diets; high-dose supplemental iron or calcium taken simultaneously
Plasma zinc is tightly regulated and often not a sensitive marker for mild deficiency.
🥗 Food Sources
- Oysters (exceptionally rich), red meat, poultry
- Legumes, nuts, seeds, whole grains (lower bioavailability)
- Fortified cereals
🇦🇺 Australian NRVs (NHMRC)
- RDI (Men): 14 mg/day
- RDI (Women): 8 mg/day
- Pregnancy: 11 mg/day
- Lactation: 12 mg/day
- UL (Adults): 40 mg/day
🚨 Deficiency & Excess
Deficiency
Symptoms include impaired growth, delayed wound healing, taste/smell changes, low appetite, skin lesions, and increased infection risk.
Excess
High-dose zinc can cause nausea, reduced HDL cholesterol, and — with chronic excess — copper deficiency leading to anaemia and neuropathy.
🧪 Testing & Monitoring
- Plasma/serum zinc (interpret cautiously in inflammation or infection)
- Hair zinc occasionally used in research (not standard clinical practice)
🔄 Interactions
- High-dose zinc lowers copper absorption — risk of deficiency
- Iron supplements may reduce zinc absorption when taken together
- Balance among trace minerals is key for supplementation
📊 Evidence Snapshot
- 🔬✅ Well-established: Correcting zinc deficiency improves growth, wound healing, and immune defence
- 🧪⚖️ Mixed: Routine high-dose supplementation in healthy adults offers little proven benefit
