Updated January 6, 2013. Also check out the Resources and references page.
Acu-cell (also mentioned on the About Dosages page)
Ronald Roth’s site has an extensive amount of information about nutrients and their effect on the body and how they can cause various conditions and interact with each other. I use it more for the therapeutic amounts and the descriptions of synergistic and antagonistic relationships with other nutrients.
Healthy.net’s supplement info by Elson Haas.
The online version of “Staying Healthy with Nutrition: the Complete Guide to Diet and Nutritional Medicine (2006)” by Elson Haas and Buck Levin. They include far more info than I’ve seen elsewhere for any one vitamin. As an example here’s his entry on vitamin D.
Iherb product reviews
Many of the supplements they sell here have product reviews by customers who tend to be supplement-happy people like me. If there are enough reviews, it can be helpful. Just be sure to look at all of them, since I think the less positive ones are listed last (first). I’m assuming other supplement sellers have similar functions on their sites, too.
The Journal of Orthomolecular Medicine archives
This has the archives of the journal from 1967 to 2008.
Life Extension Foundation forums
There seem to be two versions now, old and new. The old one has more entries.
Micronutrient Information Center at the Linus Pauling Institute at Oregon State University (also mentioned on the About Dosages page)
Linus Pauling is known for his vitamin C research, but he was famous first for his two Nobel Prizes — in 1954 for his work on chemical bonds, and the 1962 Peace Prize for his efforts in promoting the Nuclear Test Ban Treaty. Entries include conditions associated with deficiency and mainstream research on the nutrient. The site goes into more detail than most sources about how the Upper Tolerable Intake limits were arrived at for each nutrient.
Mark’s Daily Apple
Mark and his guest bloggers follow the Paleo diet (aka the hunter-gatherer diet or the Neanderthal diet — meat, vegetables, and fruit, more or less). They are usually well-versed in nutrition research and self-experimentation, as are some of the commenters. It’s not exactly a reference source but it’s interesting to read. I briefly explored the site’s Nutrition forum but didn’t find anything particularly helpful and the tone was a little too evangelical for my taste.
PMC is an archive of free and complete biomedical articles at the U.S. National Institutes of Health’s National Library of Medicine. It’s a subset of PubMed, which lists millions of articles on biomedical topics from Medline, journals, and online books, many of which you have to have a subscription for. However, I can often get the info I need just from reading the last line of the abstract. For example: “We conclude that vitamin K2 supplementation plays a direct role in the resolution of violaceous hirsutism in K-deficient females.” I’ve found books on nutrition that are based entirely on searches in these databases.
Sandy Simmons’ Connective Tissue Disorder site
My personal favorite. Ms. Simmons accumulated a ton of info and experience during her investigations of her family’s health problems and recorded it all here.
I look at their RSS feed several times a week for info on nutritional research. They aggregate articles from a gazillion journals, academic studies, and magazines including Science and New Scientist. They have a million different RSS feeds, including one for nutrition, in case you don’t feel like wading through articles on geothermal vents, large hadron colliders, or meerkats.
Trace Element’s website’s nutrient interaction wheels
In addition to Acu-cell’s lists of synergistic/antagonist relationships, I have occasionally used this laboratory’s diagrams.
University of Maryland Medical Center’s Complementary Medicine pages
This is one of the better databases from a medical institution.
World’s Healthiest Foods website’s Essential Nutrients pages
This ad-free site is produced by a not-for-profit foundation created by the founder of Health Valley Foods. It is one I return to a lot when I’m looking for information about the basic nutrients such as vitamins and minerals. Includes lists of foods containing the various nutrients and the amounts. I haven’t used any other part of the site.