SupplementScience

Zinc — Frequently Asked Questions

DJP
Reviewed by , MD, Board Certified Internal Medicine

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Frequently Asked Questions

What is the best form of zinc to take?

Zinc picolinate offers the highest overall bioavailability for daily supplementation. For cold prevention, zinc gluconate or zinc acetate lozenges are best studied and allow direct contact with throat tissues. For gut health, zinc carnosine (ZnC) has unique benefits for gastric lining repair. Avoid zinc oxide for oral supplementation due to poor absorption.

Can zinc help prevent or shorten colds?

Yes. A Cochrane review of 18 randomized controlled trials found that zinc lozenges (75mg/day of elemental zinc as acetate or gluconate) reduced cold duration by an average of 33% when started within 24 hours of symptom onset. The key is early initiation and using lozenges, not swallowed pills, for respiratory benefit.

Should I take copper with zinc?

If you take more than 30mg of elemental zinc daily for extended periods, adding 1-2mg of copper is recommended. Zinc and copper compete for absorption via the same transporter (metallothionein), and chronic high-dose zinc can induce copper deficiency, leading to anemia and neurological issues. Many quality zinc supplements already include copper.

Does zinc help with acne?

Multiple studies show zinc supplementation at 30mg/day can reduce inflammatory acne by 30-50% over 3 months. Zinc has anti-inflammatory and anti-androgenic properties relevant to acne. While not as potent as prescription retinoids, it is an effective adjunct therapy with fewer side effects.

Full Zinc Guide

References

  1. (). Zinc for the common cold. Cochrane Database of Systematic Reviews. DOI
  2. (). Zinc status and serum testosterone levels of healthy adults. Nutrition. DOI
  3. (). Serum zinc levels and efficacy of zinc treatment in acne vulgaris: A systematic review and meta-analysis. Dermatologic Therapy. DOI