Immunity

Evidence-graded topics and articles tagged Immunity.

Topics

• Elderberry — Standardised elderberry extracts may shorten colds slightly, but the evidence is small and limited.
• Vitamin A — Vitamin A supplements prevent night blindness and other eye problems in people who are vitamin A deficient, and in low-income countries they cut child deaths b…
• Vitamin C — Taken every day, vitamin C shortens colds by about 8% in adults and 14% in children and makes them less severe - a 2023 meta-analysis found severity fell 15%.
• Zinc — Zinc lozenges taken at the start of a cold shorten the illness by roughly two to three days in randomised trials.