Institute for Scientific Information | Broad based scientific information site |
| Institute of Psychiatry | An excellent UK site |
| Internet Health Library | Natural & alternative Health resources |
| International Diabetes Web Site | A definitive source site on diabetes |
| Internet Mental Health | A leading site on all aspects of mental health |
| Immune Development Trust | Complementary Therapies for Immune Related Diseases |
| Institute of Heartmath | American Health Promotion Site |
| Intellihealth | Large American Health Site |
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