(as retinyl acetate and 50% beta carotene)
In every dose: 5000 IU
Role of Vitamin A in the Immune System
Vitamin A as an anti-infective agent.
Modulation of Intestinal Immune and Barrier Functions by Vitamin A: Implications for Current Understanding of Malnutrition and Enteric Infections in Children
Effects of carotenoids on human immune function.