| bbc | bbc health - immune system | |
| bbc | bbc health news - immune system | |
| omni.ac.uk | immune system links | |
| netdoctor.co.uk | immune system info | |
| besthealth.com | immune system info | |
| thenaturalhealthplace.com | immune system info | |
| healthy.co.uk | info and products | |
| internethealthlibrary.com | immune system boost | |
| dmoz | immune system links | |
| ivillage.co.uk | immune system boost | |
| familiesonline.co.uk | nutrition and immune system (children) | |
| organicnutrition.co.uk | info and products | |
| raintree-health.co.uk | info and products |
Various resources