If you want to strengthen your immune system, you should first think about nutrition. Studies show that especially the vitamins A, C, E and beta-carotene, but also the trace elements zinc and selenium as well as secondary plant substances, play a key role. These micronutrients activate the immune cells, stimulate antibody production and also influence the production of natural killer cells. In concrete terms, this means integrating a lot of fresh fruit and vegetables into your diet – as recommended by Metabolic Balance. Citrus fruits, kiwi, sea buckthorn juice and rose hips are real vitamin C bombs. Sauerkraut and green peppers also contain a particularly large amount of vitamins that strengthen the immune system. You should reduce or completely leave out alcohol and nicotine. They not only damage the liver and lungs, but also the immune system.
Metabolic Balance Blog 