Safety Profile
Overall safety rating: Generally Safe
Zinc Side Effects & Safety
SC
DJP
This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer
Potential Side Effects
- Nausea and stomach upset (most common, especially on empty stomach)
- Metallic taste in mouth
- Headache at higher doses
- Copper depletion with chronic use above 40mg/day — supplement copper 1-2mg if taking >30mg zinc long-term
- Reduced immune function paradoxically at very high doses (>150mg/day)
Drug & Supplement Interactions
- Reduces absorption of antibiotics (tetracyclines, quinolones) — separate by 2 hours
- Competes with copper absorption — long-term high-dose zinc requires copper supplementation
- Competes with iron for absorption — take at different times
- Penicillamine (for Wilson disease) — zinc reduces its effectiveness
Maximum Dose
Do not exceed: 40mg/day elemental zinc (NIH Upper Tolerable Intake Level)
References
- Singh M, Das RR (2013). Zinc for the common cold. Cochrane Database of Systematic Reviews. DOI PubMed
- Prasad AS, Mantzoros CS, Beck FW, Hess JW, Brewer GJ (1996). Zinc status and serum testosterone levels of healthy adults. Nutrition. DOI PubMed
- Yee BE, Richards P, Huynh JC, Baquerizo Nole KL (2020). Serum zinc levels and efficacy of zinc treatment in acne vulgaris: A systematic review and meta-analysis. Dermatologic Therapy. DOI PubMed