Tools

Free tools that work from the evidence on this site and from public sources. They never tell you what to take, they keep what you enter in your browser, and they carry no buy links.

Dose totals and upper limits
Add up vitamin D, zinc, magnesium and the rest across everything you take, and see each total next to the adult upper limit from the NIH fact sheets.
Myth checker
Popular claims, such as “does valerian help you sleep?”, answered from re-checked studies, with our grade and the PubMed links.