Back   Now discontinued    All foods produced by TROPICAL are enriched with stabilised vitamin C, resistant to the influence of oxygen, light and increased temperature. Vitamin C stimulates the immune system and reinforces natural immunity to infections. Highly unsaturated fatty acids (HUFA) are another important additive: they play a key role in the building of cell membranes and skin, and act as a barrier to protect them from various pathogens. Beta-1,3/1,6-GLUCAN enhances the natural immunity of fish against bacterial and fungal infections; it directly affects the white blood cells and thus helps the fish to fight off diseases.