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Zinc

Also known as: Zinc acetate, Zinc gluconate

An essential mineral for immune function. Lozenges are studied for shortening colds.

Common forms: Lozenges (acetate/gluconate) · Tablets

Draft summary, not yet reviewed by a qualified health professional · Last updated 2026-11-03

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This information is for education only and is not medical advice, diagnosis, or treatment. Supplements can interact with medications and health conditions. Check with your doctor or pharmacist before starting anything, especially if you take medication, are pregnant or breastfeeding, or have a health condition. These statements have not been evaluated by the FDA; supplements are not intended to diagnose, treat, cure, or prevent any disease.

What the evidence says

Colds & immune support

CLimited evidence

Zinc lozenges started within 24 hours of symptoms may shorten colds by about a day in some trials; a 2024 Cochrane review rated the overall evidence as low certainty.

Dose used in studies
Lozenges providing ~75–100 mg/day zinc, for a few days only
Time to effect
Within days of starting
Studies (2)

Safety

Common side effects

  • Bad taste
  • Nausea

Avoid or ask your doctor first if

  • Never use intranasal zinc (linked to permanent loss of smell)
  • Avoid high doses long-term (causes copper deficiency)

Pregnancy & breastfeeding

Likely safe at normal dietary doses — confirm with your provider.

Upper limit

40 mg/day for long-term use

Medication interactions

  • moderateCertain antibiotics: Reduces antibiotic absorption — separate by at least 2 hours.

This list covers common medication classes only and is not exhaustive.

Buying tips

Look for third-party testing seals (USP Verified, NSF Certified, or Informed Choice) and match the form and dose used in studies.

Where to buy (affiliate)

Further reading