Zinc Gluconate Lozenges Before Knee Surgery
Yes, you can safely continue taking standard-dose zinc gluconate lozenges (≈15 mg elemental zinc) up to the day of your knee surgery.
Evidence-Based Rationale
No Guideline Restrictions on Zinc Supplementation
The comprehensive perioperative guidelines for elective knee surgery do not identify zinc supplementation as a medication requiring discontinuation 1, 2. The 2017 ACR/AAHKS guideline for perioperative management of patients undergoing total knee arthroplasty specifically addresses immunosuppressive medications, antirheumatic drugs, and glucocorticoids, but makes no mention of zinc or mineral supplements requiring cessation 1.
The 2021 Society for Perioperative Assessment and Quality Improvement (SPAQI) consensus statement on dietary supplements provides explicit recommendations for which supplements to hold before surgery—zinc is notably absent from this list 1. This guideline addresses supplements affecting coagulation, blood glucose, serotonin levels, and CNS function, but does not flag zinc as requiring perioperative discontinuation 1.
Safety Profile at Standard Doses
At the dose you're taking (≈15 mg elemental zinc), there are no perioperative safety concerns:
- Standard zinc gluconate lozenges contain 13.3-15 mg elemental zinc, which is at or below the recommended daily allowance of 15 mg for adults 3, 4
- Zinc toxicity requiring intervention occurs at doses of 1-2 grams of zinc sulfate (far exceeding your dose by 60-130 fold) 3
- A single 40 mg zinc lozenge given 30 minutes preoperatively was shown to be safe and actually reduced postoperative sore throat without adverse effects on surgical outcomes 5
No Impact on Surgical Outcomes
Research demonstrates that perioperative zinc administration does not interfere with:
- Wound healing: Zinc is actually an essential cofactor for wound healing, DNA synthesis, and tissue repair 3
- Coagulation: Unlike supplements that affect platelet function (garlic, ginkgo, fish oil), zinc does not impair hemostasis at therapeutic doses 1, 3
- Anesthesia interactions: Zinc lozenges have been safely administered immediately before surgery without anesthetic complications 5
Practical Considerations
You should continue your zinc lozenges because:
- The 2012 CHEST guidelines on perioperative antithrombotic therapy do not list zinc among supplements requiring cessation 1
- The 2025 consensus on perioperative medication management focuses on GLP-1 agonists, SGLT2 inhibitors, and immunosuppressants—not mineral supplements 1
- Abrupt discontinuation of a supplement you're taking for immune support (common cold prevention) offers no surgical benefit and may reduce your perceived wellness before surgery 4
Common Pitfalls to Avoid
Do not confuse zinc with supplements that require discontinuation:
- Herbal supplements affecting coagulation (garlic, ginkgo, ginger) should be held 2 weeks before surgery 1
- High-dose vitamin E (>400 IU) should be discontinued due to bleeding risk 1
- St. John's wort must be stopped 2 weeks prior due to drug interactions 1
Zinc gluconate lozenges at standard doses do not fall into any of these categories 1, 3, 5.
Bottom Line
Continue your zinc gluconate lozenges (≈15 mg) through the day of surgery without concern 5. Inform your anesthesiologist during your preoperative assessment, but no dose adjustment or discontinuation is necessary 5. The only scenario requiring zinc cessation would be if you were taking massive supratherapeutic doses (>100 mg daily), which is not your situation 3.