According to 17 selected studies, there's a significant chance that zinc lozenges reduce cold durations by 17%.

👇 See how changing the included studies changes this result.

Included studies

Welcome to the forest plot! Each row represents a (randomized, controlled) clinical trial, and the 𝚫 column tells you the percent change in cold duration between the zinc group and the placebo group for that trial (negative numbers mean the zinc group had shorter colds).

The middle four columns show which trials were included in the four existing systematic reviews on zinc lozenges. Try clicking on the headers to see their results!

Trial 𝚫 95% CI Plot