Up-to-date information about nutritional needs, vitamins, mineral, phytonutrients and other supplements from reputable universities and organizations:
University of Maryland – Guide to Supplements and Herbs
Mayo Clinic – Supplements and Drugs Information
National Institute of Health Medline – Herbs and Supplements Information
Linus Pauling Institute – Micronutrient Information Center
Harvard School of Public Health – The Nutrition Source
DHA/EPA Omega 3 Institute – Science-based Information on Omega-3