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A systematic review of clinical trials found that zinc supplementation (75mg+/day as lozenges) reduced common cold duration by an average of 33% when started within 24 hours of symptom onset. Zinc also plays essential roles in innate and adaptive immune cell function.
| Study | Participants | Finding | Quality |
|---|---|---|---|
Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage Hemilä H — Journal of the Royal Society of Medicine Open (2017) | 575 | Zinc acetate lozenges at 80-92mg/day shortened colds by 33% and zinc gluconate lozenges at 75+mg/day by similar amounts | High |
For immune support, 15-30mg/day of zinc (as zinc picolinate or zinc bisglycinate) covers daily needs. At the first sign of a cold, zinc lozenges providing 75mg+/day of elemental zinc, started within 24 hours, can reduce cold duration by about one-third. Do not exceed 40mg/day long-term.
A comprehensive systematic review examining the role of zinc supplementation in immune function, with particular focus on reducing the duration and severity of common cold symptoms across multiple clinical trials.
Yes. Meta-analyses show zinc lozenges providing 75mg+/day of elemental zinc can reduce common cold duration by about 33% (roughly 2-3 days) when started within 24 hours of symptom onset. Both zinc acetate and zinc gluconate lozenges are effective.
For general immune support, 15-30mg/day of elemental zinc is sufficient. The RDA is 11mg for men and 8mg for women. During acute illness, higher doses (75mg+/day via lozenges) may help for short periods (1-2 weeks), but chronic intake above 40mg/day can cause copper depletion.
For daily supplementation, zinc picolinate and zinc bisglycinate have the best absorption and fewest GI side effects. For cold treatment specifically, zinc acetate lozenges are slightly preferred over gluconate based on meta-analysis data. Avoid zinc oxide, which has poor bioavailability.